Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea1c4dab7f61d2d…

MALICIOUS

PDF

71.3 KB Created: 2021-05-22 19:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 144bf20c81b67059fe75f8079eca191c SHA-1: 98912b86aeb40945f9263b1cf0856b6781ae3fb8 SHA-256: dea1c4dab7f61d2d276a6faf7e935b886389c93fdb8c078497ba84cb9ffa4210
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

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 http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160853fff46b1f---52708725964.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a1896013da2---3821934875.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/7738f797ebc6b896651c943abd07e2c3/xatulirovozewalaxopokik.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c056678f6---sonaj.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931fc9993eb---87124204955.pdf
    • http://forter.vn/hinhanh/file/ribagexanuz.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cca6bf3652---sanivixasusezolexirefajir.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/qbdfj64f6o2t35op2673c6otd1/bapogexafaju.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1a7cae7dd8613e1135aad56b56089b74/runelakib.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a894d970f---41640926171.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081770c3cbba---nipiba.pdf
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/f8ffaae7615e5d418bfc0be045016686/vuvepikup.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/7214b4e887c080c3ccf0faf2477b2c45/96796798196.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbcce5704e---2287999977.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16076786dd2d81---3630023679.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072f66c8453b---14034113034.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/0186dec9144dd6ba2c2d5d430b78791a/pigofezijipigususelugav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=free+double+digit+subtraction+worksheets+without+regrouping
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da8d.bin
858a613990dcd310381aa4644a7804370d60a5c8b51fc1ecff78b980ba1dd6a5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 5588 bytes
font_01_sfnt_off0000ed97.bin
43e8e603d3cb82a961edf9d1311fbb66d8ce66d1c968cbdb20ab4da6de422822
pdf-font-stream PDF embedded font (sfnt) at offset 0xED97 10044 bytes