Malicious PDF — malware analysis report

Static analysis result for SHA-256 840e219a7a34ca10…

MALICIOUS

PDF

82.1 KB Created: 2021-06-26 14:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 31df08a86b95892ab0762849c3fb9dcb SHA-1: b19b752adb4ee0ec9cbea040da99b8ed84fb83f6 SHA-256: 840e219a7a34ca10e547aa4fe7f2e2637856ac9861693d715550e1a0dbb42fd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=5000+aed+to+eur PDF link annotation
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/7f7596501a3c6a6da19eec84ad2e4f92/80703002537.pdfIn PDF document text
    • http://scmsalliance.com/clients/864514/File/44946220932.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/80d2270797b86e5b7c76d728ad648725/felakuselajuxudolatur.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081bc45d467f---44831985173.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/b78n02h4ukr472duqbr171tt8g/39132845870.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b70c4536817---71683783056.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/getasuji.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/xigilekirobo.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/5e479ee1ff975a554b25c8b698ed1586/nulawagorijopisagofinov.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/ampioiqedl3n3u5bd3u2rj6hl7/64879416219.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcc8c05271---vedalusidawuji.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/bopivipovivur.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/20089584367.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083a687698c4---doxolako.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/5118f056980e8a91826a54fe8a3fb800/96386072495.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/jatubexetarod.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/cd29435c17a5f534707c82bffd4b8c0c/nifokufoxopisufu.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/229d69195fc0b5a0abc2d1c630330676/vejujekapunifutokofug.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/dorunolu.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///77704458138.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c11c5ed95---57104026977.pdfIn PDF document text
    • http://arslanemlak.come/file/gubilomipexexoxisi.pdfIn PDF document text
    • http://gtshotel.it/images/file/73464826733.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/fusetipuresut.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/d2eff4d65fbeb481e51a138a6ca6ee83/66973427453.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/17986438435.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD867 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF079 16968 bytes
SHA-256: e06e171527b23b959e768ac6eba554fa049d5e8f0182e8da5553f809784a44fd
font_02_sfnt_off00011c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C55 10088 bytes
SHA-256: 292cd0b8895b13140ee7cc980744e5d67a3e70dea1c8adb3014f384d8342261b
font_03_sfnt_off000132e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E7 1696 bytes
SHA-256: 18d4e792ecce3f905fa2ab451ccfd49c5848bf831e68a40b7d1f99915d932e98

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