Malicious PDF — malware analysis report

Static analysis result for SHA-256 867fb6e28e979e2b…

MALICIOUS

PDF

84.4 KB Created: 2021-09-06 06:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5c46807baeccc34d648d6d500d17ef88 SHA-1: 113bb284b40c2cc7293e3096eb9e549e3aecbc4b SHA-256: 867fb6e28e979e2b1dade8144395a7ab03f7f5546aba036b9ee9a41a0fe0d587
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://africanhairbraidingsalon.com/userfiles/file/78830059343.pdf In PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160aadb1def6d1---76078576466.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/ido1dn5nrt3csepvpsrl1kcmsl/60907001456.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/1cc613d5551387bf1e3df6a51023ab52/74403497502.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/figebumovomu.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/93944516130.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/1501368868.pdfIn PDF document text
    • http://computerdoki.hu/user/file/15588761512.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16128383940d22---96006202273.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/43ab31c947c3b0a251a6e84eb4e04055/11822187343.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/wekunijedimolanivuso.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d5bfc5efd---nuvokugakelanep.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a5a8ccd7a78242c3679184b8da24e736/boteg.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf21ce2ace5---bikono.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/najofivem.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/rupezutelezumesawab.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/0124a5d3af5b368592b80dedb09683a9/22665907797.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25a0690391---83271985016.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/folajaxodes.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1700c26f0---24956107507.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2132da95b0---jolibofuxifoj.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/352cb1019b41bfbca4a32a9f3af1c0ca/84392787277.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae698282b4b---57538821445.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/rkgbi47stuhb2tmf59bu72nsov/banubokukuvajazawuluna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ielts+8+listening+test+3+answers+pdfPDF 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_off0000e253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE253 10972 bytes
SHA-256: 9dda9d99bb7bb380529beb3eb033b725bc50d32b18942a58bdb5ebb9699ca4fd
font_01_sfnt_off0000fbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC9 18688 bytes
SHA-256: dc81617e1b1c981ecefcc5324631cadb31536dd23474f6875540e379d43a6671
font_02_sfnt_off00012c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1