Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2844db3ef115f02…

MALICIOUS

PDF

97.3 KB Created: 2021-09-06 08:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a94f1157bc871d14970d1f17ca9c1ec SHA-1: 19e9834b6a675a1d439452b4b079d5de9e5967b4 SHA-256: a2844db3ef115f02ee0a07e0369ef2c185fbb7ce4df87708e44ad49807c0148b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised CMS upload directories, suggesting it's part of a phishing or malware distribution infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://studiocariola.com/userfiles/files/42620501028.pdf
    • http://galantemontagnana.it/ckfinder/userfiles/files/1878149055.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/29bc53afd29182dd7482b4f2cab51ce3/41065542221.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/m9u34lu5sisum9au873srluq9l/3153967472.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aae9250e75---6554423442.pdf
    • https://cmfnepal.org/userfiles/files/zodosinuzulemewiwener.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/egnp7b5fu1n7v8tti143hadj05/18572442156.pdf
    • https://cordovajewelry.com/images/file/tobiravudub.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0732d659c3---41901273518.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/f53ffc8940aeba9fd993dd059332dbeb/49762834068.pdf
    • http://delfosventures.com/userfiles/files/nokuxolula.pdf
    • https://rlmahtani.com/userfiles/files/25652072293.pdf
    • http://meijialx.com/ckfinder/userfiles/files/tegipabuwibitulesegal.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/1agrienvfcpbho08qdlft8sau8/42285012217.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb1db22c40---romavugotofid.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/c9e747c7d37547f396900d2be798b5da/96984623356.pdf
    • https://paklya.su/design/img/upload/file/1704447615.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6223fbe237---ruzigegewemovili.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16107e3539708b---lifagemepiwi.pdf
    • https://soechi.net/userfiles/file/dapevaxezonuwexi.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/65459563816.pdf
    • http://exdebt.bg/userfiles/file/tanusinenedodofez.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=makalah+tentang+penulisan+karya+ilmiah+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011598.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11598 16792 bytes
font_01_sfnt_off00012daa.bin
15a23df8b04c361c147eeb3d07506b46e68bfbd25c8714fe150774b9d8432518
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAA 18860 bytes
font_02_sfnt_off00015dc0.bin
6e3edf941470304a5588772a25732b9f0fe434452fea57ce9fa24f856090e24f
pdf-font-stream PDF embedded font (sfnt) at offset 0x15DC0 11124 bytes