Malicious PDF — malware analysis report

Static analysis result for SHA-256 9457c77c4f1a6931…

MALICIOUS

PDF

106.2 KB Created: 2021-06-28 05:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 553e47f7e67a82c35133519dd8b66540 SHA-1: 6119adbaea19ebf4d18fd9e96b7aeec593a38056 SHA-256: 9457c77c4f1a69314b83fa821baa019426dbd84e0e051c1bb1f5691cbb59d544
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host PDF files, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the overall structure points to a social engineering attack leveraging compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/0o4b4877gprkj5rvc800amcpld/litexojolozulavopajo.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4163a3036---1610198575.pdf
    • http://strahovka66.ru/userfiles/file/zuwobuginirofij.pdf
    • http://parzenica-bialka.pl/userfiles/files/morulizixexozavo.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2edad5fd9---vowojoxoxejujuv.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/il1t42u6guvlm6ijojn7ehgoj5/kukunopozimototil.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d0bb37bbae5---kowogizujiduvajovamigipuf.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1bf6b814b---nenaxogik.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ced7fdecc01---74194002307.pdf
    • http://bobas24.pl/Upload/file/95653501324.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d58561bca8---vopamemaroxolevupomuwe.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9ced773f4---rapofemuzizum.pdf
    • http://xn--80an2aej.xn--p1ai/up/file/85148357913.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c40e8e7e06---vubosogokepemomotexiv.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8a14c9673---samuvolegilu.pdf
    • http://lyzjkgm.com/d/files/92603673782.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac604cd81d0---ribupe.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59f6ba86b9---pidulawisivoli.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc60c7541df---ginosasanuxegewurido.pdf
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/56623095393.pdf
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/18068955170.pdf
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/5nj3p4b7ruaas9l1q1efqkeuic/67777564059.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609baaae4da1f---telixalurutusijaw.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079c10262810---gawojuxuwejevo.pdf
    • https://kurek-rowery.pl/user_pict/file/domuj.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea0fa6f4fc---fogufavojakazemu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=one+sample+and+two+sample+hypothesis+test
    • 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_off00013976.bin
a70c88ecf3abfae0a8e968285fef061540412080d202232f855f2b841446b7ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13976 10780 bytes
font_01_sfnt_off00015231.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15231 16792 bytes
font_02_sfnt_off00016a43.bin
214b43a7a8dd527bf07db2d4c167c4987af88a0436e61cc2455b10b2c6b31d89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16A43 18128 bytes

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