Malicious PDF — malware analysis report

Static analysis result for SHA-256 d542c651178ffb58…

MALICIOUS

PDF

72.0 KB Created: 2021-09-06 00:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cf5ed33d2fe5924ea622f7b37ec93703 SHA-1: 80a021ca142fbcf3a6dd9fceba16f91370eef0ea SHA-256: d542c651178ffb583af1a692739cdb5db5937ce67d2f6eb125812c8f33bc7f39
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations or disposable domains. The presence of multiple links and the nature of the hosting suggest an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irishvaughans.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/xupobejekapezuxe.pdf In PDF document text
    • http://portalpr-b2b.es/img/user//file/_0123287001629794632.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088193a4887d---zimabiwejenowolifa.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/pogodona.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/46608288845.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/70611991771.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b87b7f38d---fuwodikilakage.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52791b7043---buginuzova.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d59c1cc81---zapofe.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/11cdcf38431dc39091db7cd092606fc5/zodibazaniw.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/b8b70d2dc7270a3bd734890e38883711/47719325520.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/6f9ab1aa06fa9de9a9d3dcf9628981d7/18490245565.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dba9646c8---96425006693.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///tapinimatika.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/nusaboniderijawumex.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f5f05ead6---lidezemeti.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/watigowijotezugegukimajig.pdfIn PDF document text
    • https://akemi.ro/hirek/file/lamalijapasomologafuwa.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/magusezatufolipubefilo.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/tobonexofukonopob.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d246159a7d---fegokafolop.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/batumejujusesesibutabili.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/538b83ff3a0bb66f85751b8139668622/75955952038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=page+electrophoresis+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_off0000b522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD34 17376 bytes
SHA-256: 953f0eb7c8f3690aaa1e63e0b3e6f235cf1eed485cc7d8c90220c11f50a7978b
font_02_sfnt_off0000f9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E8 10796 bytes
SHA-256: 485cd83939c3874599d0dc368b6344a19cfc9477b44e90ac90992058b0d8ffb6

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