Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eac35bbea9ab455…

MALICIOUS

PDF

73.7 KB Created: 2021-08-17 10:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b25ed9a9b7202880dc67d7b849131ac6 SHA-1: 1317fde8c54016dd918f195e0e0eee795f6da56f SHA-256: 8eac35bbea9ab455ea9f0f8e2857606ef1fefd41c2c986d6a320619ecde0c5ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://allytemp.ru/uplcv?utm_term=ocarina+of+time+emulator+rom PDF link annotation
    • https://bednidhitraders.com/userfiles/file/7743638166.pdfIn PDF document text
    • https://bursac.net/userfiles/file/2670146890.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/dijoxefozogagatefixelama.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/faxizunebof.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/fudemagazujiveluti.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/63061728651.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/86381988765.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/86712463645.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/logivojum.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/930dfa852d18158154e1002bc11a60a0/gawagabapizazigi.pdfIn PDF document text
    • http://toyotarentcar.net/FileData/ckfinder/files/20210710_3CA5914DB9F84FA0.pdfIn PDF document text
    • https://actor-conseil.com/files/file/97888419066.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/aba988bcef0018b00640f0972bb89754/xojijufoxikasarulosugilog.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/leputojeborid.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609819d9542f7---73275598634.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210707104405.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f17cced129---41819137671.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/36014398965.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd3425db05---sajelabipepodozorugaduko.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c115a2dbf---xilanazibirogizogifiwivu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/sobov.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/610e7fe68a226.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/71504360617.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608375ff8cc78---17902685532.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_off0000bfa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA1 10452 bytes
SHA-256: 854143c7699a1d752881fb33f9785eecf9c188c5dc5800a125bcad845f256be1
font_01_sfnt_off0000d759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD759 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6B 16136 bytes
SHA-256: 468a1934f46e0af81ca1f53667b7ab6318d085fb22026234612cc2097760f4df

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