Malicious PDF — malware analysis report

Static analysis result for SHA-256 06e2f1fb6f6e04c5…

MALICIOUS

PDF

86.6 KB Created: 2021-07-06 19:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bb39b3146a67f7f86aa03c1232f9e739 SHA-1: 58f62b91dacfd119216279f50e325fe2fa888010 SHA-256: 06e2f1fb6f6e04c531d5449ba03896175703626c7c1be2a7bddec46b297b88ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting. The document body is heavily obfuscated and appears to be non-readable content, suggesting its primary purpose is not informational but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/70f3ac4879318f46462aba2a0c93a3e7/xitipixapal.pdf In PDF document text
    • https://vestol.bg/files/file/60601109297.pdfIn PDF document text
    • https://sinarwaja.com/account/files/47061579996.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a058d43c1e---2573159504.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/bcdeca6c1b680208d2c3a538ca2f2988/65414964577.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/30679895725.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc8fc7c41f---guxuva.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8088ef0d5---rinoxafenikozegemukeduw.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/vafivudutaw.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/7c22eef057346a61629e2eddc3378c7d/wumuwiturerewulefuv.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/8835fca9413928b41d356243811b4cb5/busimazobezimuxi.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/dowoledoloxobofogi.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4de852084a---kirasobolafatojijukis.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609413f2c5cc8---maxubog.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b95acc0096b---12421936569.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/bd68784921b18530fe7b53dce633a1f7/87804912984.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/37893067253.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808fd85901a---todidedomoreb.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082766797d83---geliguzogagiku.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ba80530a5fa---96016808085.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/83873304287.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/79780895213.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/848494e50e3677a9e74c70ba64bb51e5/kulivin.pdfIn PDF document text
    • http://deckdreams.com/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/kinugusegalefejizakenawum.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/6f371ef10f2c2109c2390e092e9b936e/danivomenama.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/7rne3mpc5abr0dabascq94j73l/38690822833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=collagen+amino+acid+sequencePDF 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_off0000edf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF9 17192 bytes
SHA-256: 729b130e2b7069d2184abf7af1adb8d68c761c495cecbb3435e95fe244c24c9f
font_01_sfnt_off00011b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B09 10792 bytes
SHA-256: 529a2b9d69f91ddb6de245c23c2d4fa98fd6e1fb4557f5f7f2030bc1fc156e31
font_02_sfnt_off0001335c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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