Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff1a3aebf7bb5f44…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 21:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 64ec138fa115f53851cd9d5c498c5fd4 SHA-1: 5a4baff0d97bc4a09a8b46f84b8c36d7cfaf5aae SHA-256: ff1a3aebf7bb5f44f23c2d5c8bc4b627adf16b905ba06aeb3c67fdff4d3c7f8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple external URLs, some hosted on compromised CMS uploads and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL analysis suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://hopkins1983.com/clients/861771/File/nezusoxezobinivusovafafol.pdf In PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dab83d18f8---68237611429.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/vivusa.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/jejenozajaw.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210609184927.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/wobezavoxitoz.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/nelubenawapokasabozato.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e220fe0c86a---renemivuwalimerajisevaj.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/fanarufinatofaxo.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a6013ae3b8ceb02f3ca0df317a78fc49/xetaz.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/10691465902.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bafe95ac1b9---logaroruganeroxok.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/4095218563.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/92579559520.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/94866463246.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/7a2d02b5bdea1edb240fe0148e4ff3b0/kedesorefil.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/5513460258.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/subudixa.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/zukuxuzexikejeximatun.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bb9f4fea7---zidokakog.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8674c3ced---27064600028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=green+day+good+riddance+guitar+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_off0000dd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD32 19556 bytes
SHA-256: 498c1d9044042aec9198908525f19036bcc0ed52f53037eea297026ec2c9c327
font_01_sfnt_off000110e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E9 10832 bytes
SHA-256: 6f7449242bdb09dceb4a6a3a9a51869ea305f888a8b77f72da1e9b78ab4b2db5
font_02_sfnt_off000129df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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