Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b23b2a77feccfb…

MALICIOUS

PDF

90.9 KB Created: 2021-08-15 00:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 447f6d733a46b167dabd2301970d6d6d SHA-1: 5672442230b81a4243050c430c1cbd3a3fce9b47 SHA-256: 23b23b2a77feccfb84a9202e3ba4fe6d3431f9baaacc732719d571f675585c66
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a462ae6e0---39627954191.pdf In PDF document text
    • https://fl-forever.com/upfiles/editor/files/nanibep.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/jukuf.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/ac0de82301d837261405286ba03e0184/riviximovu.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/fmpf03dish4n4netnpdujqvmul/jawafizopiwuva.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3169319c12---palozuleruko.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608438a904108---20143680013.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bc9670dac---kojok.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16083c6a7abd0a---7320792727.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/turiwilu.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607869398c486---lexodije.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/82310254905.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/23051599468.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/47593580563.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099150ae070b---wizapakopikudoxewibusefo.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d21a4520d5---sitijubosuzepola.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf06f69076---pixekemodubuzoborutuz.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/zulesegijusizipowoxav.pdfIn PDF document text
    • https://tsegypt.com/file/44570890737.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/714c0b87317726258b36f704f4a056af/65100220018.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/782402563.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/rigozobesolomenowum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=japanese+wii+safety+manual+pdfPDF link annotation
    • https://mediaget.com/userfiles/files/37155254484.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_off0000fa6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11286 10728 bytes
SHA-256: 7466137a565b6329cfc3886407689505224a7ebd7970fcc1ae96d40cff6ae795
font_02_sfnt_off00012b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B41 20460 bytes
SHA-256: 23326bf9400dc1efd40ff21b71f68384ecf5e0e528fb92a0cdcb3db4c0780bdd

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