Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93421f0f563e72b…

MALICIOUS

PDF

94.0 KB Created: 2021-07-05 14:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2baa20f0a659d4bbedb751b97ebff4b SHA-1: 3a8b829aac1ad76244c3e62eedd63aad18b6f950 SHA-256: c93421f0f563e72b05e890afc83e7137ebf1ec217ba7065a7054adae8deeb0c4
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://infrive.ru/uplcv?utm_term=45cm+x+32cm+in+inches
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4cb183f7e---6126758121.pdf
    • https://boucherienabli.com/uploads/FCK_files/file/livisinis.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a1683388eb0---jawidotadozojigexu.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f23c50da7f---17274962962.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f4ed0abbf---rowuredego.pdf
    • http://envigest.cz/upload/file/setilu.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16083b60b59188---79377294769.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d14c12682---38928418041.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bd1a74791---95752048969.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/58e55e9fc2af0d9e123e9b484836aa24/tidujezameborulugarukomin.pdf
    • http://libertyquad72.fr/userfiles/file/55490761176.pdf
    • http://albino-pitti.com/pub_img/file/69308174690.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a0f382912---wurinovob.pdf
    • https://triosms.com/userfiles/file/99555986659.pdf
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/89328608998.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/2a0fe443607d6641dc23978a050c7b5e/12175136351.pdf
    • http://taxilitomerice.cz/ckfinder/userfiles/files/dijux.pdf
    • https://conexusinternational.com/ckfinder/userfiles/file/75515884225.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/aa102e2c662fe04c8bc5f689c4b8a66f/vibakef.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/pukue3uo7c6htv8hu37fhia8lo/77535625731.pdf
    • http://gyobel.it/public/file/28531969262.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/nrnv2h89k7h10di41g87j5q507/60048365762.pdf
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/7876621462.pdf
    • http://agnieszkapawlik.com/userfiles/file/19543870394.pdf
    • http://asiavent.com/UserFiles/file///riwajerewuje.pdf
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec16.bin
52bce7d0ba0be4c85e346881ba6b6399da955664db7e5e9b4c53c1706d8a5cc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 18196 bytes
font_01_sfnt_off00011c7b.bin
1341a2af4be739e858c3329a560262f88429065c1b870d81bb302337d906ead4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7B 10480 bytes
font_02_sfnt_off00013419.bin
9c3c50ca7885eb1b87261f6f74ba185aca171ae216209544253fbc3ee3acc073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13419 1720 bytes
font_03_sfnt_off00013c3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3F 16792 bytes
font_04_sfnt_off00015450.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15450 16164 bytes

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