Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6acea7f53c9c88…

MALICIOUS

PDF

96.5 KB Created: 2021-08-21 04:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe270922e8b309e586cbabc035e8ccc7 SHA-1: e90074bf42605fa45a58ea90a91297d53c815f1b SHA-256: 3f6acea7f53c9c886d19ed6711b4310a8cb5177979526970cf2ed50b1bba524a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ee8da1360---newofowamin.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607716c0cc23c---35995382221.pdf
    • https://rumputhijau.com/contents//files/zutosugolujefujibukutov.pdf
    • https://aljazeerahdrilling.com/userfiles/files/dosufogud.pdf
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/86532678603.pdf
    • http://polimak.pl/userfiles/file/70983039316.pdf
    • https://ibliberia.com/ckfinder/userfiles/files/dovidodikazakanalevisuz.pdf
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/61192633551.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6ad0f2430---82208284921.pdf
    • http://cadelupo.it/userfiles/files/kovoxider.pdf
    • https://rmp-traueranzeigen.de/cms/files/xepafadamojosa.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/poinu35mahk9m0i6lepem3mov5/gazebogazibulegafatol.pdf
    • https://calprin.com/ckfinder/userfiles/files/96703071742.pdf
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/98650788161.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b5975c179---84566910569.pdf
    • http://groupkaishan.com/d/files/5393916615.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d20cee09f0---labezekosego.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781d3e225c8---panokasojabij.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/7544418392267407a7d8d57413b8207d/18242019962.pdf
    • http://caramelitos.sk/files/50005037317.pdf
    • http://chanakyaaerospacedefence.com/userfiles/file/39752537145.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/36b7091cbae47444059fbc6ce1c08011/tolosaxajofijuti.pdf
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/tofug.pdf
    • http://sotel-perm.ru/site/file/92173190553.pdf
    • http://peterpan1996.it/userfiles/files/95744167627.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=space+wolves+codex+pdf+9th
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114AD 16792 bytes
font_01_sfnt_off00012cbf.bin
130419149b34b6140a4e9c8db9f7b8d1e5afabae66eb2ff114da7a76a74e5adf
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBF 17348 bytes
font_02_sfnt_off00015a16.bin
7bb53b13167246a1ba5899ffb8d63597beb523b82d909a5086b378d18006458a
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A16 10920 bytes