Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff9522f8cd84a93…

MALICIOUS

PDF

79.9 KB Created: 2021-06-26 07:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1671f45435efa159d18aab99a35d20a SHA-1: 513308e293cc7b1064a2e823a4fb8b7477d684e3 SHA-256: aff9522f8cd84a931a83915e13c2cb242b87f2bac29ac6421534e462307ee511
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting sites. The presence of a 'download' button lure suggests an attempt to trick users into clicking these links, likely leading to phishing or further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://charivne.info/images/file/20794948525.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/58768bb277089d1e718bac933f03bd57/duxumupojusulobiriz.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c18c2867d---69353049320.pdf
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/rixixata.pdf
    • https://ms01bet.net/contents//files/xigiwazipokuxu.pdf
    • https://amatnieks.lv/pictures/image/21038397347.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bf46a595d---vinazasakopalare.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c333c78a9c0---sidizozolosofikonesowaw.pdf
    • http://botosani.ro/img/uploads/file/fodivonav.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/k8s2qlo9if245f5ek5tjob9sn8/10533331989.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4ab0a0719---lakexotogogolidolirid.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/h7k52ipoos15ufcngg2ts5ol1n/14078545660.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b0a9cced7---41084094224.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fbf814791---31893642081.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af9655bcebf---50803746794.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/81a5674c59113c300658f6db8e75ac2c/lufimokajinepeso.pdf
    • http://gld-lining.com/user_img/files/soxupotadakafitusenawaba.pdf
    • https://108pizza.pl/uploads/userfiles/files/2641572901.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a7bc0a1b5---duliruboriluzebo.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/3205635f6d0da11074263550095964be/56419150204.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa43153e28d---46023078131.pdf
    • http://candientuvibra.com/images/file/53072456187.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=orbiting+the+giant+hairball+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_off0000d31a.bin
95ce03c5400c944530864e717cc5704f470bee03f99725089885be71db89579e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD31A 10860 bytes
font_01_sfnt_off0000ebbb.bin
7e4195d6e4fff6099ca9b8e4e57b1f68aac8ea39ac3e025175331e31867f3e6a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBB 17416 bytes
font_02_sfnt_off0001185e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1185E 16792 bytes