Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ffd7a4a5392a56…

MALICIOUS

PDF

92.5 KB Created: 2021-09-06 02:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e40180aedc642ef4ddd7390785045b92 SHA-1: 2564f62b4254dac814209cd807c4f34f8987c00f SHA-256: 21ffd7a4a5392a5653cb57588deb4ae331c9e852f86d285f7a4bed100f207527
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages, indicating an attempt to lure users into a compromised state.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6015aaad9d---sozurawaburorup.pdf In PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/vonowitepowanumo.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/6fa51f6f35af535b2c962b2dc8fe093b/48074013064.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/26894193039.pdfIn PDF document text
    • https://begili.com/uploads/image/files/visipew.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3b711d6d1---7389282584.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/jenajulutulube.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/v5tkkv1eb3f7rtjt8ovgeinkr0/tokorekazidi.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/xaduzo.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160ad600191144---75296664400.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8e3b286f9---jidubu.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/53807634304.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/5611343163.pdfIn PDF document text
    • http://fotossc.pl/_files/file/jarilixumite.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/92158964518.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/fc8eda811ab4660b05152bbd38d61d5d/fexotisagolizes.pdfIn PDF document text
    • http://asfcursillo.com/clients/879797/File/32611156115.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/43401606892.pdfIn PDF document text
    • http://ruresept.ru/files/file/22931086418.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818fab06e9a---16038991220.pdfIn PDF document text
    • http://esen-life.com/userfiles/file/81467763331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=usmle+embryology+pdfPDF 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_off00010187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10187 10644 bytes
SHA-256: 25defdf43132f53e794bea86c81a5c5cd609a90f256ea540cee4be426e3cd2f8
font_01_sfnt_off00011975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11975 19644 bytes
SHA-256: de4debb7a5be2edfc5a0405619b3e835f5489b1080fcab3b088dd65313065b6a
font_02_sfnt_off00014c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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