Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f689a8b05547f9…

MALICIOUS

PDF

86.8 KB Created: 2021-09-01 03:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a00472a163ecce798988f6bf92f9d90c SHA-1: 4479f13cefaf5e307c2bfbf628b33f605d35d554 SHA-256: a7f689a8b05547f9fb484bc9c7f64790f970c992cfc173756d10135064583ea6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm, including links to compromised CMS upload storage. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The primary attack pattern involves luring users to potentially malicious or compromised websites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://rchs1964.com/clients/5/58/580abc73d3aac4ea3a2bdd7c75327783/File/duwodubamowozut.pdf In PDF document text
    • http://www.trotasierra.com/plugins/ckfinder/userfiles/files/42598524889.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a90cc29824e---sejatixuzasinumapo.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210818005004.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611a59dfed42c---vexijeruwule.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/7tt3a678p85ksm33uq16qpqmmb/3541214014.pdfIn PDF document text
    • http://terralindahigh1981.com/clients/866868/File/xutebilazutigujubusa.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/nld9pnudt4ep2ljasb24oj4hv5/sisoxuxeworafewise.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119206534e73---16943003927.pdfIn PDF document text
    • http://skyfestival.kr/ckfinder/userfiles/files/fokelitamam.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/59182529973.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/eea4c1baaf23086b9c9b7d19f5dc5c0b/tavaxumobopokuje.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/67q0g0o97lbqthq224v1c4ilb6/jegobatixesilula.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d197e5e38ee---57795902271.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611786949c8b4---faseguvidi.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/69601994030.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/d122fe79d60d24aff06630b0f897c0f5/gosuvilefipowanu.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/witas.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/80338740686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+day+of+kindnessPDF 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_off0000e3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC9 10376 bytes
SHA-256: 25667422b8ad33fab949aba432e819f0fe056976b53afded66692bca6add596c
font_02_sfnt_off00011336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11336 22068 bytes
SHA-256: 8e0d279d35e13016a6bb455ad76179110df9cb49c0a409a2db9f02aa8cba22b6

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