Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce66b5b407415a3…

MALICIOUS

PDF

95.3 KB Created: 2021-06-28 18:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 231aae8790642baf34742d28f3b54cc4 SHA-1: 00d344ce123d16152df6c5148aae3d645672d41c SHA-256: 3ce66b5b407415a373d28c2579231501e405c67a7a95f6c70707b52d86121a64
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The file contains numerous links to compromised websites and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of an IP address literal in one of the URIs further increases the suspicion of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://matthewsmillsreunion.com/clients/c/c7/c7863f7b93cb17915b2a89d887155530/File/kosopiwivarajosa.pdf In PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608573e16b5a0---bomuvuju.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/5b3df7f4e1b1cfbf24cd559a385c0648/18628370556.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d76d442d9---sonineposisexuratare.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/f5b6dd8f0a321770ed4d04d900c8266b/kekugefolukonometoxovitij.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/4d23e1c4c02f185aaa98ae37f018b06c/gafipopisegejekutabiv.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebabe646f5---zenumokozeguriwekatof.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/2ouubbdsdl097cinjqkt9sef58/rezol.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/39609311225.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2807d97a3d---85960150016.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087078f902ff---rerovusotida.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0441484168---91291554800.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/48480599036.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/9791498b12d475519a8f31f3d55a27a5/texulojolil.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/d6f73867ca4eaea78718f1a463706733/xonisoxewimo.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867b9f15633---pamumununefiz.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/tejfrc5br74ifo40tbpqf0m3t5/48281366712.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608391e77d242---3132567861.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160cea3caaaf03---15734490859.pdfPDF link annotation
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609422c40fa19---48469843082.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16078efb8ee775---tavategokawixukuxake.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608219603fe6a---90757066336.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/98813501667.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/nunafotekat.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b03501c03b0---21504943925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=wotlk+private+server+instant+80PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001113d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12954 10724 bytes
SHA-256: 5fcda4aa7b2b4d6af7911c807f3c0baafbd5d78a480591fe73792dc4d111ddf9
font_02_sfnt_off00014222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14222 17472 bytes
SHA-256: db344535e0d822051a8754a09985e507a561edf8454fefd64b40d5797d95d99b

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