Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff2d20a3aecce14…

MALICIOUS

PDF

86.5 KB Created: 2021-06-25 17:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25dc8006b0e2ace36a3c7e7f548118df SHA-1: d783d531cfb61bead41b7dd1dbe01f4d7608b565 SHA-256: 7ff2d20a3aecce14f2e7cddd1125d7c36cba4fbf6e45878b9b13ec3dfc6b1797
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/8fd62f8306cbf4780262e4d39a8fbdf6/95217922131.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ftnkidmlktbjv3pscb4mjb47q6/88306866638.pdf
    • http://bajajsports.com/userfiles/file/34346724202.pdf
    • http://abc-tel.ru/data/File/zesovezamixazuji.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900e33b1ce7---gazareli.pdf
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/38566926720.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16099472c80032---mijuvebagisuwemotin.pdf
    • http://eko-inwest.eu/upload/file/25306777349.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/fdv9tdjb7ans7b31nd4i1aceg8/813503187.pdf
    • http://osoboebludo.com/ckfinder/userfiles/files/dejazezisuruxikutawawap.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/f73io186dvkbekagalb2o6tfur/kexijodulapudukewugaxuji.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a5ff80f2a---gufenekaxawigofagabonalug.pdf
    • http://www.dismaplant.com/ckfinder/userfiles/files/53028280245.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/fbfcf964f4beb7e6f02fbd5e1c25f30d/63804455808.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/97b9cd1aeaeff9916528db018dccfdd5/subunogesanu.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/870c6ffd5b640fd664c1a93a22d7c473/76648095467.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/06n7cj9umrmatd8ridd2sef946/47352596583.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608698fde21a5---misug.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/3fqi1fhm38vrubhv7kqbrmi163/xavonabuxutawasi.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af96f543419---96617906979.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/74bb4fd3289f6086572afd1f146b5246/68217634757.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bed62bb314f7d70a5218cc23f5da29f9/sosowudogowuro.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/8avdttt9cthv4lo0642fispfb7/jedomawunurikojetixe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=furthermore+in+the+middle+of+a+sentence
    • 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_off0000ec02.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC02 16792 bytes
font_01_sfnt_off00010414.bin
fffbac7951dfec95c1449d1a35e7c6ad8597cd31a7206689e3b1166a6ed282eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10414 17696 bytes
font_02_sfnt_off00013279.bin
ff55c411b96c1d2532f72da8643205e62b0f6415b1593e2c49779780b1d12dc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13279 10820 bytes