Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56ffbea111476cd…

MALICIOUS

PDF

107.2 KB Created: 2021-07-08 10:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aab132a77ae588a5a701181896bde402 SHA-1: f1130e7f1fe1206a4fce8f1eca54c99504e708b9 SHA-256: f56ffbea111476cda444d0cc5eaa9a55c437f6d5dcc7c668fd7458459d397028
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload sites and disposable hosting domains. The document body is heavily obfuscated and contains no readable content, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1b9e89c0c1---77534866382.pdf
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zutoregi.pdf
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/89561365533.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160960af5c1afa---wotow.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ba611b61d---vazofezukugugopapogajuma.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/4stbubssjl6ik2hfbke8vq5dnf/vunivifalijigigevojejeza.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/7af1c8b29e95f34080088939c28dcb68/43778269957.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4c3b79f21---toludibajeliwibutapapupiv.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62d0daba9---53925719706.pdf
    • http://www.awakohchang.com/image/upload/File/oluteriv.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/72fc2dsk64q5kpi190fccpb913/93287058383.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/32ca5073f904f8356fdbe8edaff21977/xelorobixofamaxavonemabag.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/fd780de60398f0992cae84acb4be232d/mupatil.pdf
    • http://arunimaflavours.com/userfiles/file/gotizudolanawakutu.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607487c0af60a---87414453866.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/1cb8vh3nk747g0hhhagq6mj5vo/53613230352.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/bdb1b5fde4b2e03e218f961c86744b20/leluxupupanosewunu.pdf
    • http://parkhighclassof60.com/clients/871169/File/73482176008.pdf
    • http://sakaryakasaplarodasi.org/userfiles/file/fivarafupotibedujuzij.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b877abb2e3f---neguteti.pdf
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/90149200847.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/iblc7rcveqpr6bass6h6ok589v/nivamowuripefugedufatutoz.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607223cbe8adc---sosukuko.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/pubamenazi.pdf
    • http://hzjksj.com/images/upload/File/16951267028.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/hpd7riv466kpn3icgopsrlapnn/16211753951.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=time+from+earth+to+moon
    • 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_off00013eea.bin
d392aa7797ce7a61f2ad634502b5e68b958576f770a91b913f766ee68e709df3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEA 19524 bytes
font_01_sfnt_off000170b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x170B7 16792 bytes
font_02_sfnt_off000188ce.bin
7a1412183ff9fb09d1a1a7a2f30f238ea2ff4ee92ae01073d69064c5503d2685
pdf-font-stream PDF embedded font (sfnt) at offset 0x188CE 10228 bytes