Malicious PDF — malware analysis report

Static analysis result for SHA-256 812ecf8e747fbe38…

MALICIOUS

PDF

69.0 KB Created: 2021-09-24 20:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e6b76b409a2603fb4612b0ea3ae5095a SHA-1: 14c2fd9e304c8f3707a46e7e4dd9fff593281d6c SHA-256: 812ecf8e747fbe3802c1054ad0becaac6df476af2ea0ea40313481e111d66c00
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://m-camper.ru/ckfinder/userfiles/files/tafobarepu.pdf In PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/towekijevupekipavupeg.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7bbfe75a0---xadeloxuviz.pdfIn PDF document text
    • http://vitrine-prof.com/files/83928904667.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/kefemed.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/fosemevidami.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/61664220744.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/11347542644.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/i6tpnrlqp5ui7ra26rre6hbjhp/sadokubodofe.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbc69f0d5f---92439589116.pdfIn PDF document text
    • http://www.bash.cl/media/file/40606333788.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/54870105500.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/womafegadigejubugojop.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/12235623666.pdfIn PDF document text
    • https://airshow-bg.com/file/bodujegukusaxogexuz.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/20988250225.pdfIn PDF document text
    • http://usmleworkout.com/files/file/2254676854.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/fofofoma.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/zetolekomuf.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5d8c3073a---13869070591.pdfIn PDF document text
    • https://equinox-e.com/upload/files/70358681140.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/dorumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=50+shades+darker+streaming+servicePDF 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_off0000ad95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD95 15448 bytes
SHA-256: d8511cbe0690faacc718a414c834bdc20e5baf5b5441e4cfbea9ee5accd9911f
font_01_sfnt_off0000d50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50A 10968 bytes
SHA-256: 67c861160a3f87ed8c3c6788a0605dd04a1f3d69dbcbc0af146fa705709211c1
font_02_sfnt_off0000ee3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1