Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8f6089c5f40688…

MALICIOUS

PDF

87.8 KB Created: 2021-07-03 12:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 713fa6cfdcd84a4b9c9206e81a057bf1 SHA-1: af2a0178c31fe88b4ef2d98b6ce7fb4b64241be6 SHA-256: cf8f6089c5f406882e3c41b48ac6fa44d7fc9c33a011394da8b24c3266208b4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites. This suggests the primary goal is to redirect users to potentially malicious content or phishing sites.

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 https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f1b21d008---nelisanugifuferike.pdf
    • http://brezov-gaj.si/uporabnik/file/poxadawipobimegu.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb0edd9544---podagavobafifevez.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/4d6a0202df39315891cba2c3150931e9/jogizosemuko.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/51657e2cfd392fbafe102888e7597970/juserelax.pdf
    • http://polletnv.be/uploads/files/5051382049.pdf
    • http://tischlerei-schlusche.de/sites/default/files/file/93879147771.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a332b7a7178---97044089112.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083960b3e885---78081537306.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e17a0e208---17877041526.pdf
    • http://asbazainville.org/userfiles/file/wasapi.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c2d75381a---fuxezisosolojowufolep.pdf
    • https://777mto.org/contents//files/rupized.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f567e8bcf---rusikevevelijoxutos.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/1a6177d618438ddb94e8c392726b7f20/4865529556.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/aa4246203e52c5786c85407a26b3e2f2/32539083389.pdf
    • http://3wsystems.com/shipinc/userfiles/files/memezedamejusonixibirado.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b9824b0eace---gewafivisokinevibeg.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/81f0cc5e782ab62356e78cc439cc5d9b/zezazojesu.pdf
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/porojemufidur.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84c30851e---58524732588.pdf
    • https://groupunsur4.com/contents//files/1022666092.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acffe4a0e48---13799793360.pdf
    • http://atthaya.com/file_media/file_image/file/27468023439.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=native+american+proverbs
    • 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_off0000f54a.bin
97d7e9b4ef28a8f0320be511a8d8b3d543452ebbfe73e98cbf9f96b2dc93cbdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF54A 16724 bytes
font_01_sfnt_off00012056.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12056 16792 bytes
font_02_sfnt_off0001386d.bin
ac69422931352015630441bf3f279cb83c0df71185d4ec2c3bd105170409acb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1386D 10672 bytes

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