Malicious PDF — malware analysis report

Static analysis result for SHA-256 421052da9c1f39fa…

MALICIOUS

PDF

75.0 KB Created: 2021-09-07 17:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 23ff79c200a698847e63fd5d6c66ed00 SHA-1: 88b6bfff38fd869bcda081d697e82ed34b1eff46 SHA-256: 421052da9c1f39faccc51bbec00562e1489fa53d0023f800b073438070797982
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's used to distribute malicious content or redirect users to phishing sites. The presence of multiple unknown URLs and a link farm heuristic strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b914a1d7d41---88415443467.pdf In PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/vebegutorada.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/61476874930.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/ba038f6eddcbab77ef7cfa76d96681e0/40157290908.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607af6134fe7d---48075766634.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/62533140689.pdfIn PDF document text
    • https://digireg.sk/upload/82424240672.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fedb459567---99388420352.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba289a866b6---60399340270.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3446121f9---31432627608.pdfIn PDF document text
    • http://abnicum.com/files/file/45283505735.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f50351809---funukofosesutiwiripek.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/3b1bf9137962a17ab0fc67a5a5e5bf90/24621608084.pdfIn PDF document text
    • https://digireg.si/upload/75628405252.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/rlg276hc2n8ueepdl2a5hh1tfa/98566716445.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/0bc330253b506c728e2bb9b06ed2e393/50914877603.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/10473508085.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/49881871610.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/71533942433.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ac5584b86---tofuvasuladulabimilak.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/91723779878.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/2c81f2a4193ea60312c8a2ca83834b82/pimatamotizofifavibano.pdfIn PDF document text
    • http://peoplefoster.com/pliki/52934725509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=worldcard+pro+business+card+scanner+user+manualPDF 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_off0000c1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E2 17080 bytes
SHA-256: 0e546168715eebc9201793199727b583d18dc8e16059bd9c6b1005ad92cb39dc
font_01_sfnt_off0000edc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DE 10808 bytes
SHA-256: 67739f12b8197009b14c958367b0d2cd2b018528d571114aed8293151750182b

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