Malicious PDF — malware analysis report

Static analysis result for SHA-256 0450a762db90feca…

MALICIOUS

PDF

83.8 KB Created: 2021-06-30 20:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 49f3143dcbe35cfd27f206d1e52ac39c SHA-1: 8f542f03cce7669c46f134436dc854b2a4acae3f SHA-256: 0450a762db90fecabd9212f0d36270e72a5eaf14fc5491d9bf9eb91fd5235f12
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress installations, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://archism.ru/uplcv?utm_term=argumentative+essay+about+using+animals+for+scientific+and+medical+research PDF link annotation
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a46d96057---lugunonipobagukufivosupen.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b1316e835---puwuxelupabiki.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a7690142f---5401943183.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/lapunudepijozufufaxilejuf.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f825dbc002---56557611693.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/2d5393b4b5fb32b8b0a8a912849aa9e6/35874651110.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35e15ce569---96367470923.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2105100705516053393il8os.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/3r4blf8cegcbsih31mgnor9mh3/zuzoden.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/31423172c406350f97128cb6c117793a/nujurefikukeweke.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105021836518160.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d0438e2e0---kenupeburo.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/xegobulikedijeto.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52927a2d6---90576930465.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/rofagaxasezikusosa.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/gajiso.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/51949995884.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/e11cqut5u871a33rlpgp2018u0/98028724885.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/83081916185.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/0afarmerc3bkeqgjvbv36vlub1/sujavamiwaxolegidujovo.pdfIn PDF document text
    • https://raljob.com/userfiles/file/silizolixijawajekisupek.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/6509775991.pdfIn PDF document text
    • 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_off0000e446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE446 16484 bytes
SHA-256: 6cea6d12553779ed4fffa0104365185da9bbb3d4b61b6751d5239bc0e8754a29
font_01_sfnt_off00010f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0A 11324 bytes
SHA-256: ec37b5e6fec29b36f45ca58ba78a19e87376ce53b5a7af2c7a0622abe4f43b2d
font_02_sfnt_off00012958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12958 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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