Malicious PDF — malware analysis report

Static analysis result for SHA-256 338993244fc82ba9…

MALICIOUS

PDF

82.4 KB Created: 2021-06-11 00:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ad23259ba2622b19979de4c48fbc0970 SHA-1: ca5f1a101f1473fb4ce54307db88c805a8e38bb6 SHA-256: 338993244fc82ba9eeb5d39cbd482e4cba20c4ebb55f2898e639182ee39f7037
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains a link farm pointing to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The presence of 'utm_term' parameters suggests an attempt to track user engagement with potentially malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://queure.ru/uplcv?utm_term=the+big+bang+theory+season+8+torrent PDF link annotation
    • https://juniorclublivorno.com/sitonews/images_upload/files/kisum.pdfIn PDF document text
    • http://envigest.cz/upload/file/12095931478.pdfIn PDF document text
    • https://www.jedeminute.de/wp-content/plugins/super-forms/uploads/php/files/q1pr868afd3t34ja4ftd3l24kt/1667832038.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/timije.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/rewuwigafesozotiraxazamav.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083d485453cc---94911088613.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/cmv0dtobq7h55h5s7iibjmr2p1/jimigulapenewigidusepiwig.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46b1a06643---63164058005.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094c2e829587---jigimemusazafuxokafivo.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/27384781819.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607704b4b58e3---wudowukawetado.pdfIn PDF document text
    • http://chouchoudauphongongtay.com/upload/ck/files/lovafadedoxexago.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/79ea9eec63d3da15d560c32d39ee0a8d/7964637604.pdfIn PDF document text
    • http://www.asslar.de/downloads/45594007104.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/2h1msvidm2jo0l3to2mv6e6s26/rilibap.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b69863c26---kufukikeragege.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f501c6b07---sosusunonavivuwimarep.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607087b2a20fb---11213566476.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AA 4748 bytes
SHA-256: 33a2347fdfa58021ade291ada45c49129efdfc203c704da2da249fff295b6f5a
font_01_sfnt_off0001013d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013D 5300 bytes
SHA-256: f8faf44b3f61328a03e20a820bc86f5ce9cb7d35b50f809b02fb4585c3cfef0b
font_02_sfnt_off00011342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11342 13488 bytes
SHA-256: 2b6e6fb0a89ca381b9be47134a4d742d998386cbb2c09e5b45df81f7d8d7fe25

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