Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeefe39f74021982…

MALICIOUS

PDF

73.1 KB Created: 2021-05-26 16:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 009a0fd170163bf4fb15bc142c913638 SHA-1: 8ceddcf2a61e36ee09a9fcbfdf11f670542fe311 SHA-256: eeefe39f7402198236d1ced38be91e88c4004eb507a58dd5639d5349f1840877
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories, suggesting it functions as a link farm or a distribution point for further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it is designed to redirect users to potentially harmful websites, likely as part of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/27p9g75icmv59s4ad8rbepdjuf/mosebosip.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7fb50adca---rezevupikupakoj.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/ae7a3718bcf9140cace07fa192234c42/negitefotanutituzo.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/rh9u7o5qin4296uibv18n4vuu6/zixipejigikurinejakag.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/8fd6d3651ace1147da922acec8451829/notam.pdf
    • https://infoenergie-loire.org/userfiles/file/57192507360.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6217941b1e---fisukadigogo.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/knfn1v04qktbv6g77v0su1ab34/61969535098.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b917781d7a---51146626038.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f3f92f654---dusigis.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/f387c27335c618660aca4bb3702fae73/mozuxewaxumuse.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b762db2a19---23665227019.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606eee2f44561---vopadog.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dda4c5d827---tusirepo.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/18b5834f9dd2ea5802d45e29838e23b6/teropoxemisuruziten.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+is+a+bond+polar
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2dc.bin
6f57c23f6f55f6175c90454522eff420ac350276de1ff884b0f4d6e3356ace58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DC 5148 bytes
font_01_sfnt_off0000f46e.bin
0c3a1e4ca597abfcb5aea575765203ef4826c6dac3e67d66e43121e4afeaa1b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF46E 10404 bytes

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