Malicious PDF — malware analysis report

Static analysis result for SHA-256 191574da2b25c517…

MALICIOUS

PDF

83.3 KB Created: 2021-10-08 17:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7160c8e20c6e9ddfbb51be73c2deaa12 SHA-1: 49a07fd0d825e352bd70dc101271dac12ea9ee89 SHA-256: 191574da2b25c5179c8eb448571d6ffbd6fa061b6365cc44e49639c5e0533f61
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous external URLs, several of which point to compromised CMS upload directories or disposable hosting. The 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics indicate a pattern of leveraging potentially malicious or untrustworthy hosting for distribution. The presence of multiple links suggests an attempt to lure users to external sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://calienglish.com/ckfinder/images_store/files/vamowazekopejupofobu.pdf In PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210919_77447E370678C473.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/37122595807.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/6d6a463c4423c8a72e83c821fcdbddb9/10672425076.pdfIn PDF document text
    • http://sinoorchids.com/image/file/56408635757.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613473b188196---piwumererifopidatixeti.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/39885950468.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/49747677646.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/pajagexiposukanajar.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/jinov.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/152703834261449f3839b46.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/25573440222.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161568515cabfa---wivotujarunabobos.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/zikuxikunisijofuv.pdfIn PDF document text
    • https://balmbeach.hometeamcorp.com/images/usr/88496842494.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/58395896332.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/46175174941.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/16311750855.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/fowud.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/55669153139.pdfIn PDF document text
    • https://thevalauryscottage.com/caningest/images/file/23974991120.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/48540738474.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/4bb19ed32f831c002f3d8b3fa121169c/mowavavenebisit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=instant+remedy+for+tooth+painPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE247 10780 bytes
SHA-256: b91132bded9c87df948e4d2909ee1c33f5f2bf5f1cc3b1fdbbc0cb0d3a48615e
font_01_sfnt_off0000faf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF0 17740 bytes
SHA-256: 5c74929b5047ec7c37eeec29a7068ecd6d2e324516366ca9b33029de156eb71c
font_02_sfnt_off000127e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1