Malicious PDF — malware analysis report

Static analysis result for SHA-256 3722e74e9c999bf7…

MALICIOUS

PDF

88.1 KB Created: 2021-08-21 15:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c616d08d3301057651e4f03bc6ab1af3 SHA-1: 7f940f61d48f051d9e670653cd0b782c8dc5664b SHA-256: 3722e74e9c999bf7d4ffa0e480e43a6c987dff75a816afcd9d7ade5aea820c52
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://agrobud.net/uploaded/file/dudaboniguxawusupazed.pdf In PDF document text
    • https://audit-advisers.com/userfiles/file/zunekesuzezipa.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/pobawowaguf.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c5544c1b8---8564179932.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/9894ac5e119556f9e4a058bfd1bb409a/41635704816.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/18536249806.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/malajipolawutujowewizenu.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f05c5b9d1d3---84034696106.pdfIn PDF document text
    • http://fitviewer.biz/files/file/tubibenesuwotupev.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1ce1012f4---99644066074.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/lrsmnbunpgqfdgjrrmbjhlfma4/supawamukafofulezid.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/tuwusiramejodubexozadof.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/tazerogobexatol.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608477cfbde11---vulugix.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/53524263179.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/2pc13oc80nq01i2ad5b7ljhcnp/ranukuwig.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/70382276474.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/8f27cc367bbfafa7bc39a5b0dcda5b0a/kamikubalilo.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/80352784494.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/297cdb607911eaffac7d1f4dc88dc608/51445652440.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098de9bec324---68907645836.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2c56539f4---zakadujazuxo.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/saxaxak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+pass+the+aapc+cpc+examPDF 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_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 17592 bytes
SHA-256: 79af439c9d9488fb227389a3c0afecf2bc7f8fd5577f06366eaf3255c450601f
font_01_sfnt_off0001222f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A46 10476 bytes
SHA-256: d7bc3a0ddc05400b3c6f7bb04d7e881887b9cf9ff234c38d472617b5e5f1d000

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