Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c13cf02ebd22521…

MALICIOUS

PDF

103.1 KB Created: 2021-07-17 09:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: c93ba1defff7b05cb12e4dc3da8c27b9 SHA-1: 0cbf3ea1dc9eaa2b6b9ff61369bae589f8fccec8 SHA-256: 6c13cf02ebd22521808b8403e456a9e14b9315f952870b8224d32f3209a22767
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9687

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://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160809ccf1e76a---bozoxenorodapesepala.pdf In PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/2t4r0cmrfhnnfo5rlnd3sctrm4/96071397061.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/75016151774.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/9242504429.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/12437611737.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/73335175199.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f1f54c028a9---vewuboxemuxelenujowuw.pdfIn PDF document text
    • http://renovator.cz/files/file/gowufubabixekowidonojetaz.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/mamojuvunujosizijonoxula.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16085f9da2c00c---fofagukejutamigogesara.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b826b1255dc---99434115537.pdfIn PDF document text
    • https://denimder.org/resimler/files/63006987557.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/29132443228.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/teledezore.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/jha4m59d1tacp4d4rlm328bo5u/84759098935.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/44963420938.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160b281a4e03f6---wawenopoginebofubabeg.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/28059943879.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/m1f6hoiiegnt5hilrif12tkmo5/62739121349.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/nonanirinokumobijofedux.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/s3vu7qkia56piq9c1r77mg2cd3/69658947276.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/137fcaa137732b9e65bf3c20f69033ed/kasipofizajilewo.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/a7849a9d8ec585091694dfc43d8cc3f5/jikojejusolutubap.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/dujazapopazuwivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=law+of+continuity+in+fluid+mechanicsPDF 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_off00010786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10786 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9D 10896 bytes
SHA-256: aa39def3771ec0c5dd76c74db548614ae11649f1ee529023d4ac494c6bc81d17
font_02_sfnt_off000138b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B4 1900 bytes
SHA-256: 8f440b404c7d9dd54c5ae3fec56afe37596dbe0b41a4add84b68a46f17203d7f
font_03_sfnt_off00014182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14182 20080 bytes
SHA-256: f73bfdcd0fff37530eee36d15c82f69f972c720fbb9c84056889d40c420f5d10
font_04_sfnt_off000177be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177BE 16284 bytes
SHA-256: 4161a33c7532d13c00e7e731cb626d62bc8b7f7c0e8cc1c6f1a7dcb3ad45de5f