Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2401c1874e2ec76…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 17:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 8f772187eed08e0d86a06d3aa01a67f4 SHA-1: b8144e9bcc2986cdff067d86b196ce4304d86480 SHA-256: e2401c1874e2ec7672ec1d2650eceef89ec88e32b5b1a6d8de813b23d75d76e5
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.tecnologycenter.com/admin/uploaded/fck/file/19557779073.pdf In PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb216d9674---43914715593.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/dorofepawos.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/57976706582.pdfIn PDF document text
    • http://saydersan.com/firma/files/89882115328.pdfIn PDF document text
    • https://andana.us/files/files/kukukemedipaguvifumovar.pdfIn PDF document text
    • http://cssh.es/img/file/sasiwotalisa.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/jejowolofemefux.pdfIn PDF document text
    • http://inistor.com/ufiles/files/gitapexe.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/afax.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1f81add92---pujotobexalezedowabosup.pdfIn PDF document text
    • https://nexusmediation.nl/files/sapobigesemonixubis.pdfIn PDF document text
    • https://adikkedua.com/contents/files/bijegaxedibebatil.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/57306911534.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/53741683548.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109010716177211.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/gokaxasovonijufoliretaz.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/82730864998.pdfIn PDF document text
    • http://besteva.com/upload/files/sitedutidijezizadokora.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa338c86d3---gawobawape.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161488e4aa8af1---67678927378.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/48207077976.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/jajesozisaxunos.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/fadululesug.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/53522325431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=scott+pilgrim+androidPDF 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_off0000dbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE9 18264 bytes
SHA-256: 0f168c249be2068f84ff77c6500328f9b79cceda9fc47aec2f082cca36607b44
font_01_sfnt_off00010b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6F 10632 bytes
SHA-256: bc2595c97a127d84743e7290bca4bf90699a300d989212dbf0a9a63726a8fcd1
font_02_sfnt_off00012383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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