Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ed4382c808772ed…

MALICIOUS

PDF

84.1 KB Created: 2021-06-27 04:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97a04ee050c18fb2584372dc33120bb3 SHA-1: cfc875ece632341a066e71633a0b0ec10b5c21f9 SHA-256: 7ed4382c808772ed2cfd828322f62a1dfc9a214258a29df4155c00fc9dcc36ad
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the heuristic firings suggest the primary purpose is to act as a link farm, likely to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091bcade926f---fedusexiwasipomaj.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f043eaef0f---nulunozuxojupikebawajuma.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9ec5bb24b---tetubovupajowuke.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/05drva01gqohovar1ad51iu6h2/velosipodebi.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/393cc9faae4dd2801bd406b77fa3a59e/27284125179.pdf
    • https://houstoncoinshow.org/FCKeditor/file/kowudixid.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7edae16c0---11473485012.pdf
    • http://tutek.eu/userfiles/file/kusorixezuluzaxibofilax.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/ce937f1821fbc2547b34bb4af74f7acd/deropapagujifadow.pdf
    • http://meble-tk.pl/userfiles/file/xabobef.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/bc70585bd84353328cb81c01810a9b42/81053378506.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9b34c010a---59593466528.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/dd93bfbbd65d3b836eb2966d85d22e70/duzovitolimonopun.pdf
    • https://mangonebike.com/uploads/file/68353336894.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/5d434f8959a7ae8b207c845ea7fe6a28/86933512506.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607801f7d82dd---87220933136.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d40526ba958---pubuxutujumamunubazigeto.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/cc65386759e6919cd7246b50bd5732c6/kilibaxapesiz.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/tt0o2q1q2h03i7uo21qg4sr490/vodezafelenefavidimaja.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a713c7b220b---55623540508.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/bfs1vjpnuokp7m96kn218cjt31/14505028803.pdf
    • https://steklo-shik.ru/userfiles/file/47079547825.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/a6d018b333996cf67da3a2fa6f9fe067/28856179938.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=fastest+race+track+in+the+world
    • 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_off0000e6d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D8 16792 bytes
font_01_sfnt_off0000feef.bin
496895ce57938e4ab02c61056ef7b15c44f8582fe58f86e6eb781bba6ed9dc39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEF 10620 bytes
font_02_sfnt_off0001172c.bin
ee4c87829da1a8b6b97c2b9539959d0688c091da2ce78965c1fccdc6712e63cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1172C 17432 bytes

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