Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f68cd480b22744…

MALICIOUS

PDF

79.7 KB Created: 2021-09-06 05:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e9496fbea7f99e9dc8b87cd204e05764 SHA-1: 5ad2a5344b4ea12b2ce0888ae55b6ea2083eb454 SHA-256: 72f68cd480b2274489ba6d4cb4cd88baf777e8e7e5861c9bb4bf016ffe45b276
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, serving as a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=lanham+act+full+text+pdf PDF link annotation
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e0dbf556---nokulegetumirodaselewe.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/58608455743.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac0e75dcc---2610660093.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/fogifenol.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/32144625854.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/5a563b5a272242d2492a24ada23a0a85/bofij.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/bipukobimubozatagase.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/xezorimawubukexaso.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe602aedca---besin.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/86343ca12e8ecd8e890f2a2f398f15ec/toxegejawibujusisewi.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/84275249587.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/85627598692.pdfIn PDF document text
    • https://alutat.com/data/file/zilugudepetewaneji.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/56786529373.pdfIn PDF document text
    • http://beateromer.com/bilder/file/53943992245.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/1nte9tn55iptkhs02hilh18u7d/xutifa.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f25a0cf87e41eb37623fcec1afc4c546/66047758239.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16093f503eaa34---19455345622.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/zefugunekotaxim.pdfIn PDF document text
    • https://adikketiga.com/contents//files/vujer.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607222bbe001b---xugusosewimawizexej.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f006fc0a10---jukube.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/6k43lgk5upjh44p05bk5s8h5qj/79780004142.pdfIn PDF document text
    • https://siroyensao.com/upload/files/75371040911.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_off0000d32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32B 17616 bytes
SHA-256: 8acdb7cc6ff2b114b1745a10262a9d9583ffe0c5e68fcd68aa579f5256692b61
font_01_sfnt_off000100fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11915 10564 bytes
SHA-256: cdaf349353d69b1761ffb6e98a38badea6f13bada89df6b1cfa09cf7997f8902

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