Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92d79fdba5900d8…

MALICIOUS

PDF

90.0 KB Created: 2021-08-06 01:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bcf3fdb7d8b32790f3d57a6717ac4548 SHA-1: 7bca2342c4a163c6a7024afa163539f310bc7723 SHA-256: a92d79fdba5900d8212e9157ec21aa11d60c36cc706bb0bdb715893b9dcda8c2
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, distributing numerous URLs that point to compromised websites and disposable domains. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • 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://pistant.ru/uplcv?utm_term=how+much+do+wendy%27s+pay+per+hour PDF link annotation
    • http://montagnobozzone.it/userfiles/files/nifegaxoropirafabefituf.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e322e5aba9---1848052477.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/57862317463.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/miwowaworirixunefefulojul.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16199002034601.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a32fe0e0589---lerolebijiramamukere.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/jutusalawaniwobuba.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/dagojoga.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/955503193.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d578bfae8---bavigetibigupusuxeb.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/19d654461dd52a5f7dcc032778c47c5e/rimezazizoligujodur.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/58228629356.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7f60bc680---vewesidib.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/guveledoxujebemunewutas.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-25/20210625215040169197.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/55933995181.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/jenixujuwutimejew.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/71481391926.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad93e8bf0ca---25778468807.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/rutixiramegogitefo.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/a5c8a9d2f2320a617ae846b03cb0b024/soxekufazetajinag.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083da5119e36---jenidunoteluxuvowosulijin.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_off0000fb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 10868 bytes
SHA-256: 51178c4596c052a6cb63133c44dfb0d8e40bf5680f82f15e612b5c8dc93c02ea
font_01_sfnt_off0001145d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145D 17392 bytes
SHA-256: 44e05bb56c2347b7a63e6bbf4a8afed484b1ac43040cefbc07096b7bb01f0d47
font_02_sfnt_off000141e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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