Malicious PDF — malware analysis report

Static analysis result for SHA-256 722913a2ba2e8872…

MALICIOUS

PDF

90.6 KB Created: 2021-06-26 21:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b56751b328cb07e0796ec4d14b031b3d SHA-1: ed02774baf48113da0033453336465b50267eeb6 SHA-256: 722913a2ba2e8872062533e61328b1727eff8662f231cabcc0917311c691bb61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or conduct phishing. The document body is unreadable, but the heuristics strongly indicate a lure to external, potentially compromised, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f74879537---fobaremor.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a25a469e7f1---65210806670.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccb9c91d9f---rikabikijomeledokadonuzo.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f8eaa1d18---vexerofujesefubofopajez.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/2f53676c3d86e315e8eea274d6719b75/fogok.pdf
    • http://toshiba-center.ru/uploads/files/6503212111.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/d29a94c3ec2cc1fc689326c20f4e56a8/68760065889.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/441dbced1bd6792e59802e7b0a3a9bae/7931019692.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608f96d5d0ace---59748568576.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/51657e2cfd392fbafe102888e7597970/juserelax.pdf
    • https://etadelloro.it/images/file/lizekivijefuju.pdf
    • http://jrpst.pl/userfiles/file/64863999832.pdf
    • http://alnoorcity.com/userfiles/file/25404774645.pdf
    • http://omni-links.com/images/blog//file/73862787065.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba87aad0bda---firuxavobijifizupamubotuf.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/c6f2r1djh5gn0l2s5ic2mn78g9/76130073351.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb26629ed8---89769490505.pdf
    • https://mobile-translator.eu/app/webroot/media/files/17521067743.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/16ad860f84d70312efea342e3e577d1d/zisosonujukabulemet.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/2a23e8a8a4e75f260449f1ee40026463/91696355760.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/7a2421ea59ce8e4cd935a329c7c9c7fa/22566464117.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-6-1/20210601013035674053.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef314e2bed---xolimowavibuvorobibux.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/530b176fa6099aee77519d483d651d5e/84978319258.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=when+do+gray+squirrels+mate
    • 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_off0000ff36.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 16792 bytes
font_01_sfnt_off00011748.bin
e3968f61943ff0acd26ee90333432770719fb04cbd6a756f8542909a3c6aba03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11748 17192 bytes
font_02_sfnt_off0001443d.bin
33788b7464754c447bc5d142d444885f11ab730a8d08c659000d90ea08c786ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1443D 11048 bytes

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