Malicious PDF — malware analysis report

Static analysis result for SHA-256 56dc81c4b298b44a…

MALICIOUS

PDF

84.1 KB Created: 2021-09-03 00:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a98da0b6bcbb4d4727f6788b1388e8b2 SHA-1: c0b17c3f3b561426488a7ea6b2cd2b28865ba32a SHA-256: 56dc81c4b298b44aedeef83b390e5a741922af81d2145044c71c1ae3719602c2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable domains. While no scripts were extracted, the structure and URL distribution suggest it's designed to lead users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://sovaimm.it/userfiles/files/terikofexazalavepozom.pdf In PDF document text
    • http://meyanko.com/userfiles/file///50359847014.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/zamiruxopoz.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/gijurejofuluxukufototez.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/cc73bf44fc9143883917c883b8a18aa9/mekogukomo.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/kisiporagirodijowovulepa.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607730b1ccaf1---satesekevitot.pdfIn PDF document text
    • https://dhesient.com/media/19209557493.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/fkk1t9ultl7jb8l5p7gmbn29f1/64361122570.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/87533681174.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/c12c58c27a75dc325cdae5cbb97bdc89/15889275097.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/vokaseravegar.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/godugapidikomivetekegefo.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66892c43ba---sikapororakitukonolo.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/95432790282.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5fa00a4a4---sajum.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160987611bc7d6---54619676979.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/99965217318.pdfIn PDF document text
    • https://emprenderem.cl/files/tipewipukevebuwenox.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com//ckfinder/userfiles/files/77840152202.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982aaec7ed8---xidetazidarogikelaro.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16111a3784cbc4---xadagoxigogeseguka.pdfIn PDF document text
    • http://hzbaoyan.com/images/upload/File/46572959616.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/4c5e34c7e1299aa5b3638b13d1f18ec4/fivupuxum.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/zuxusum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=2008+chrysler+town+and+country+touring+owners+manual+pdfPDF link annotation
    • 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_off0000dd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD48 18908 bytes
SHA-256: 66c1f36fac8107bd2fc2f18e171685c20c4e3b42b0a05850954df5039c731e95
font_01_sfnt_off00010dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFA 11720 bytes
SHA-256: 90c92f5f1ff5f01fb45e4b3ebbec90d5f7ee4b1740fa55886522bff53fba7b39
font_02_sfnt_off000129b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1