Malicious PDF — malware analysis report

Static analysis result for SHA-256 845756d9401f4cd3…

MALICIOUS

PDF

77.5 KB Created: 2021-07-03 05:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05ba9ff06b39ea1ac5cf47e6d42dcf76 SHA-1: b65fb565fa27c188386a9e96f156cb318030c965 SHA-256: 845756d9401f4cd39c8e7dd011faa8ddbc1618701593ab84a31af89fb00eb1d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to host malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan delivery mechanism. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://oklogistic.lv/upload/file/72947317575.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/3a9c63f51f717ec713e31ee38f9132e3/90152662491.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/jekk7ac55pas92lap8tvk29g07/27337962397.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/e8e5c8f46c8399ce64e1a105a03484a7/2654972261.pdf
    • http://apexibd.com/uploads/fck_uploads/file/sewakusajisuzit.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160983a1152adf---77576086100.pdf
    • http://arniestribu.com/campannas/file/7701104015.pdf
    • http://watthaistuttgart.de/userfiles/file/tideperepajade.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b29e14c11be---merokegabanizo.pdf
    • http://atut-biuro.com/uploaded/file/sonijifot.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/b150052714caf838a011db313e381305/rajifiguxef.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/catk1f0296tdu94260s701bai4/34623789581.pdf
    • http://ahlhy.com/uploads/file/302153024081.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607929e47cbbb---31576359413.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/1lsq3pcg05tk7kfc83t2lod9pf/32138501954.pdf
    • http://choinka4x4.org/cms/files/file/9917566022.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/20b125701dc93d022c150a9faba13a7c/40608059857.pdf
    • https://sheenabusesandcoaches.com/userfiles/file/biwitepafesidazarumo.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8d560f782---faposano.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/36f1baf663d425008fe3dd04e9f98859/95632037387.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/5c6d3bcae661084cd6cdfa4b30b84dda/vilalisawuzizozoxewo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=horticulture+book+pdf+download
    • 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_off0000cd21.bin
246d4ed8006c4904f6afb3b36cd4182b62081591b24e6aa4c81e1d1a7cfdaea6
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD21 10852 bytes
font_01_sfnt_off0000e61b.bin
3d14fdd381d20b4435fb5d884b6288e4498fb96b0328fdedd5879a5ca6dab161
pdf-font-stream PDF embedded font (sfnt) at offset 0xE61B 16416 bytes
font_02_sfnt_off000110d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x110D2 16792 bytes