Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc17bdac533048e…

MALICIOUS

PDF

100.9 KB Created: 2021-08-03 19:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1772d8d71de560db0a7a96a13d8a68f3 SHA-1: 952c59b59df8c2da6c2a00aa9561b014ad71bf90 SHA-256: 3fc17bdac533048eb260646d88ec3a0684b3e3157f83b6ee9fcad5d13161e568
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm pointing to numerous distinct hosts, many of which are likely compromised or disposable, suggesting an attempt to distribute malicious content or phish for information. The presence of external URIs and link farm heuristics strongly suggests the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9520

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 http://ankaser.com/userfiles/file/40188544836.pdf In PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608200e7d0ef2---84311849779.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caa171d531---88605032098.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/puxosudu.pdfIn PDF document text
    • http://nicosiacaffe.it/file/88268902817.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e19239ea2---fafasevefekiwidike.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725f6390eee---63371268295.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb57e2a7c9---56668179134.pdfIn PDF document text
    • http://zuestag.ch/userfiles/files/93226480696.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/nakinafu.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/nddqv6a3gfgabhghscouq2m6jj/pujuwabenifum.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9dce1b94e---xakapuzelakapekemujuliv.pdfIn PDF document text
    • https://superchills.com/userfiles/file/dewilo.pdfIn PDF document text
    • http://espicycooking.com/files/file///94918997074.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103bfeae34ee---nadevoxadedipud.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4677205499---87949959252.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/69782782679.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/vazagozof.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160962db58c288---23853642752.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/95713022868.pdfIn PDF document text
    • http://fairmonteast1975.com/clients/0/01/014dde3c838f86fef2ac1d31a86c415b/File/42351913380.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16106fef8309d7---mefekemasuvo.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/95534414793.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/obadkcjr5oi66r0eph332g56mo/waxakelewujexokinov.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/2021713234955.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/4ce63mvf9kvcdt8p7j9c2uk4e5/rekidexebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=bubble+shooter+classic+apk+free+downloadPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF592 17932 bytes
SHA-256: 51ad25a0270e705e88b80b68543408166c32da71fc49f61ad0f45918f0870a61
font_01_sfnt_off00012540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12540 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4D 3784 bytes
SHA-256: 59b20c8ce563782a54a18841db383e5f2fd78fde88ed759396bd912de189764e
font_03_sfnt_off00014bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BB5 11188 bytes
SHA-256: 71ebbd03fe731610ede580712a4917b22f11944f2cad435ad8fe570f295eccf4
font_04_sfnt_off000165b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165B7 20312 bytes
SHA-256: 15da2a4e7483a784a17e95b769ac523ed90718c9b2238f6ae6f0281b501d7420

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