Malicious PDF — malware analysis report

Static analysis result for SHA-256 a633bb34d175f9cb…

MALICIOUS

PDF

85.2 KB Created: 2021-07-01 14:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 63a59b006bce1e0ca36663faaad330e5 SHA-1: 41f52175340bc6e1e09dd5cf5a3e9b4faf580499 SHA-256: a633bb34d175f9cb3b57b9cff7fe17e899adc8c4e651718b64cd5d1c441008fa
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites. The primary purpose appears to be directing users to potentially malicious content through a chain of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://bluebirdcanada.com/FileData/ckfinder/files/20210616_44B4FE6AF32342F0.pdf
    • http://illinoislivestock.org/userfiles/file/34236152629.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/8a6sfttbhgb30u8qkq16j0etoa/87343112192.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ce9fc716e84e7df9eecc8cf88bc8d0ed/4271992936.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/a60e321e2917d77fd81965751780aef0/jovexojupenowobubasil.pdf
    • http://anthonyvienna.com/sites/default/files/file/papen.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/74116be5474b1cba008a43b0f1adb9f9/70198425452.pdf
    • http://bogieclassof67.com/clients/71235/File/58177174186.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073531420af9---13572645541.pdf
    • http://dlikefulproductions.com/clients/875850/File/78668334410.pdf
    • http://damoorefamilyreunion.com/clients/7/71/71c8bb141a0941b69292984b9770a174/File/46730675722.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd91fb35c0---taferusizijukavite.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1c986a93f---46006754699.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/c27d3cebfad7600087cfb0602af44ba9/zonexepizatipatofinuvexen.pdf
    • http://alibabashipping.com/userfiles/file/84197371665.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/887351ca515e1e66a5dbac700707bc5b/59121353980.pdf
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/74588848762.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/vdabe96s83203c15ifr3il2ou7/javobiden.pdf
    • https://morganmethod.com/ci/userfiles/files/nonone.pdf
    • http://tragiaocolamsapa.com/userfiles/image/file/46942001195.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075463b9b71e---59496906669.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/e7e0c75fc01c4181a787913affb3d6a4/tabefewofexuverazinivakal.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0e364cf9e---jepimakog.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/ab27c8b9746c7d45688e3c4e7d25f122/41018851386.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd9da612f6---25796001663.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091ca8c6cb2e---29959542450.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=file+discrimination+against+employer
    • 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_off0000eb58.bin
9b7ac90a2581cc245cedf81d0243221ca01b2b7eee378d4b5890b6a862eea384
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB58 10948 bytes
font_01_sfnt_off0001047a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1047A 16792 bytes
font_02_sfnt_off00011c8c.bin
684e420b752f06d901411cdbb84005345a2b0952c4da0bb971c957530d46f02a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8C 16484 bytes