Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a9be82f645cd61…

MALICIOUS

PDF

66.6 KB Created: 2021-09-14 10:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0bd0cf5e4f0b5679936ae95b27d0b61d SHA-1: e5debef2ef96e0cedc4964a44ca3f4be726f27ba SHA-256: e3a9be82f645cd6160b6ebcef8c2512778c69f2334a7a3cdf468d4a69f57fa77
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://philabc.ru/uplcv?utm_term=pvz+3+hack PDF link annotation
    • http://kmjmt.com/news/upload/file/210903120340799773rsom1c.pdfIn PDF document text
    • https://mbbs.hr/files/zejugojaxoderazurafe.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/715fd0259e3ddcb435655a6db04c0618/15487759665.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/66657028632.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/dawujibajenemelivobo.pdfIn PDF document text
    • http://asid.rw/userfiles/file/fifukadijagebuzutugodaxu.pdfIn PDF document text
    • https://network-italia.com/file/63604644074.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/wumab.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133cf20cabbb---gabufumadogipevenofa.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/pakaponikosariwufifu.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/bataja.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/tobolusumakiwakumamu.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/cb45371aff24454601e2657f637eb19c/funanejutivobesu.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/sevukaxolufunasodasiwo.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/62235367310.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff0db148db---gulorosujezeset.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/mumisiwij.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/51012717644.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/21382085292.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/tarutokijixi.pdfIn PDF document text
    • 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_off0000aa91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA91 9860 bytes
SHA-256: 80ae90ad51cb153b41e0cb349e4a8ee29626dddb119a0c950e74168a2e17ae31
font_01_sfnt_off0000c064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC064 14852 bytes
SHA-256: 4aeb4cd1a77ac85832a95ef8e27e05c7f99a90bd98a651e4592ab008e0d3d0b7
font_02_sfnt_off0000e59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1