Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b36dac68c5489ba…

MALICIOUS

PDF

84.3 KB Created: 2021-09-05 00:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 41ef9394c9e9596e0cdfc601a7c01f61 SHA-1: 28fcb48c29b8700ea20d5bb1ebb71ad2fed78b1e SHA-256: 4b36dac68c5489baa733aafad0a34f833513144b61f2d064cd445556b01642fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

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://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/02ee7d5b1bfb24d7dd71bd323db918da/38142138486.pdf In PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/acvieqpibm70k33liqdfsn1o4q/29179660038.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a566e0282ad---38535983882.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/57284214269.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/fifirepuj.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/43346209439.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/73bd081f2623b0ba594f058f4802aa66/jeturewiliwurugoxizeto.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/af8261uv712iubb9qigkpuede3/vigusexeganoritana.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f798cb7a20---59583967332.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/cij8tdfl50cldu5bke2pfr1h7o/tanipalavetav.pdfIn PDF document text
    • https://laser123.com/geektic/files/rikibawa.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210719192422_62jime.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/zafijaxufi.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609743069640d---10962312614.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cc03b24bf---kiguguwosodavajerulefifab.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/78705334564.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/d61da56649b377d88b3c5b258917f623/38902069987.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092dc7d488a3---72986503634.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8187aee0c---futed.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/sum5g91l6fs5am6ossgsh7goqf/70175303033.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/86107605929.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/81176974631.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/xejosalosurowudokob.pdfIn PDF document text
    • http://ns.adobe.cIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=nook+glowlight+plus+manual+updatePDF 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://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_off0000e4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D7 18260 bytes
SHA-256: 1c2dc9ccdcb76f44c2da5668c826fd04f2cb624ee38824001e7414c593c41554
font_01_sfnt_off00011409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11409 10992 bytes
SHA-256: 80d86bcfc80e0465f2c44ffb54694b9d03e0fb17110ff152fe7c3ab84e0f63d8
font_02_sfnt_off00012d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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