Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f449756f575c72…

MALICIOUS

PDF

102.1 KB Created: 2021-09-06 18:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c16906d6cd7d55c56f30846e04848ddb SHA-1: d7b54940025b2ce0472f090c67985a74ee26f02d SHA-256: a1f449756f575c72578b12d1ea2489242f212feb3b46adf39fea2bac104bd9b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous websites, many hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are typical of a lure document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://aftckwt.com/uploads/file/9899403389.pdf In PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec40984abe---60066966742.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160760ce86629c---73652586814.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/nixesaxojonokemekutizet.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/qlutscm8jatbae394tsrae9unk/88161539208.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/nbgevqn28q956hodj1fr9butr0/duvasalogaxiwupov.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/in88kp6a2ds499shhu9ojsung0/35651847822.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/finufiwuwivebapabuzitul.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c49071b6afd---50132315775.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/42442359279.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/vezazinibe.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/io9rp7d5k5sd6r28mkkcci8rp0/21272839691.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/84347440190.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/71039217491.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/71081919415.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/33616107355.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/97971158094.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/ac77ebd9e4c905f048aeb094a553ad6e/vegedara.pdfIn PDF document text
    • http://hiddenroots.org/clients/19739/File/67448551422.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/popemuvalosewagomuzav.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16081a9e15105a---59777682924.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/vamatesozasasaxi.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/nujutesejelifezuzifigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=assemblage+charpente+bois+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_off000124df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DF 11188 bytes
SHA-256: d1ae7f8c16f98aadf44a87591480c26a41425da00d1b9eba85165a1ceeaa1d98
font_01_sfnt_off00013e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15687 20140 bytes
SHA-256: 228af43457c24aa59e3a5dfd150f7b348ae1b94e2c7fb0d639862c66db60ddfc

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