Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2c7ae4c58a9907…

MALICIOUS

PDF

71.3 KB Created: 2021-08-27 22:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88c3cb279bcc4477ca9f3a5680f48048 SHA-1: 9f363062d8edd5ab6c8599ab2a86ebb71c1b8b67 SHA-256: 0a2c7ae4c58a99074d9c2028a4583260cd8f851f82cbad05cb1fab602326d31f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites. Several of these URLs are hosted on compromised CMS upload storage, indicating a potential distribution or hosting mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://birnagarcollege.in/userfiles/file/lipaladakinu.pdf
    • http://aggengr.com/uploads/CMS/file/parikoxuxofataleroz.pdf
    • http://bularz-auto.pl/images/userfiles/file/45377533347.pdf
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/80a4577c05aecf0b007d1ff02aec5d22/62380682089.pdf
    • http://educasters.co/ckfinder/userfiles/files/todepokafedojik.pdf
    • http://phdpecs.hu/userfiles/files/49081702249.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b553e5ade6---81619387854.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/237ae0d90804741bce6841fd854ab018/45288827868.pdf
    • http://daiichihr.com/uploads/news_file/61364994081.pdf
    • http://prvugkh.ru/uploads/files/gafogolabawovodikiwo.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607a63dab8f6b---76652012277.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/14a906cd035d3b1ccf5c4bf74a93ec05/weriwavafiresosu.pdf
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/sipodo.pdf
    • https://matrainagycsalados.hu/userfiles/file/wurativuso.pdf
    • https://topconta.ro/userfiles/file/kizobipobuzo.pdf
    • http://reelproductionshd.com/userfiles/file/93142320276.pdf
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/kaxupiginaleponutaro.pdf
    • http://pileshoppen.dk/userfiles/file/36121882227.pdf
    • http://www.aportecnica.com/imagenes/editor/file/wejawozatazamoti.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7ef5bc79a---44140643383.pdf
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/6781884672.pdf
    • http://energo-winstal.pl/userfiles/file/bazolizapuka.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+fill+up+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_off0000b98d.bin
ec9cf2f16667ac47b1cd67e674157b705a965b573da95c7e44b9b970d2f39e96
pdf-font-stream PDF embedded font (sfnt) at offset 0xB98D 10004 bytes
font_01_sfnt_off0000cfcb.bin
c821149bc884c64c13706b97107ed769553dec8b212ad2c3bfd7871733ff3928
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCB 15696 bytes
font_02_sfnt_off0000f78d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF78D 16792 bytes