Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ecc9aeec30488f4…

MALICIOUS

PDF

82.2 KB Created: 2021-09-08 11:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b09a6c66f2b2b3897c4a15a6c5c410d2 SHA-1: 3014ed98c22d3c79fcc737186201e7873a6d5d55 SHA-256: 6ecc9aeec30488f464db5124e6d3ff93bbbe184c32f18759d6152a5115fff6fd
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests it is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jasmijnbloemengroen.nl/userfiles/file/46608566313.pdf
    • http://brilsports.ro/userfiles/file///gugiri.pdf
    • http://www.dean-cpa.com/files/adminpic/file/1568709587.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/2oi2qfgsf07e90ine3v7hcb5ci/kexozitumubeveden.pdf
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/dizunipavimogumafinegam.pdf
    • http://lacasedescaraibes.fr/file/dosuti.pdf
    • http://interiorconsignments.com/media/file/19163878889.pdf
    • http://naturestuff.nl/siteimages/file/23180612114.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/142d643231063cac0bf8f63a85bf6f56/95810679773.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/cf8a03c43401e470f5617086c9933743/38743900426.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/1c0cf8c487facab19335f9371418d07f/wukup.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/0hcv9mpsmr19r5rcidmuc9jgb6/natalosa.pdf
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/jetopajedalarinir.pdf
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/ribofijelodi.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/bcaa99a49d49b70c775856da00d233c7/vudetawaxir.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5732fd0924---71746997349.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/2f5acd848cadafbb0d01c84851e5ede3/13179270164.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/3257184022f52426a1cf2232ef3c17ff/ladam.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cafcff3d8c---51641133733.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16137e0a83a810---53822968088.pdf
    • http://vangphutai.com/images/uploads/files/27384605663.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=business+english+writing+advanced+masterclass+pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbaf.bin
04b81a7124fd3f9434fb60fa3f5a546ff22a4abe6d826ca6c44b830dea671924
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAF 17376 bytes
font_01_sfnt_off0001085e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1085E 16792 bytes
font_02_sfnt_off00012075.bin
139d38702edbfe00d20fe89d1058903e63aec14c4732318b3c7d044223144b69
pdf-font-stream PDF embedded font (sfnt) at offset 0x12075 11252 bytes