Malicious PDF — malware analysis report

Static analysis result for SHA-256 f640b89ec50a46a9…

MALICIOUS

PDF

90.0 KB Created: 2021-07-03 14:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04fe44cb7133171f5f7e05ef05c1531e SHA-1: f3fa087a6120829573708fc4a0fc0d42e8e1c7fa SHA-256: f640b89ec50a46a98aad23b11a7ea7adfa2fc36a49d55cd5e54e6d68c66b5d84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised websites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of PDF link farm heuristics suggests the document's primary purpose is to redirect users to these malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f14b2f1cc9---46655547780.pdf
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/3606c53a013f29e928c487a1c37c6e23/vuwumeferemikivaja.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bec034b76b5---54988939813.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab92118a9fe---nesadegapiso.pdf
    • https://liniagdanskzydowo.pl/files/vesididosus.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/j464spfjvdnj5115nhauaae86a/tituwadeburimisusub.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/6964c99d8f43167fb296e9cb7cacb00c/9134457487.pdf
    • http://pngroup.pl/ckfinder/userfiles/files/68325629943.pdf
    • http://uptownchantilly.com/uploads/files/pulolurovixafisanekuvolad.pdf
    • http://zxsolar.com/d/files/karozinozojir.pdf
    • http://www.kammerpop.de/files/file/5630375764.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089f5dfd2a10---18158434438.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ccbb3599f---vonifud.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6044bd2b2---tozoderuseto.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/falhep05075c58hlv087i3mui2/xatubobil.pdf
    • http://vaness-sens.fr/ckfinder/userfiles/files/15658103528.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa95f87226---rifotarekadelowex.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03d924b790---12641024668.pdf
    • http://naturalmis.com/userfiles/file/bomukuxonopimevepozaxawa.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aabc42db746---66021318471.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/89c63a9dcb8110044b9eb3df171d642b/kasisodudalexase.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9483e6166---fasilukesurel.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608005ca0095a---zexipatubamusuvugevoxab.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=different+types+of+rice
    • 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_off0000ff28.bin
319fe9142c991cfcc735b6ee450fe78181ae63377e3a3ca398cf6901ce9a8144
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF28 16980 bytes
font_01_sfnt_off00012b50.bin
f511911cafd2554d4c4fe836d2e53898e6026246c6ccf735806ac3b5ecb744d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B50 10380 bytes
font_02_sfnt_off000142f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x142F9 16792 bytes