Malicious PDF — malware analysis report

Static analysis result for SHA-256 c339cb982863364b…

MALICIOUS

PDF

76.3 KB Created: 2021-08-01 03:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1623bbc84f7be20a1d9c53fce0f9d621 SHA-1: 8f5db4b18dfd40299f415f1923c781c8e1af2835 SHA-256: c339cb982863364b700aae0e1c8a89d94d2e19772ed7af00f44cff25cd4572ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that direct users to external websites, likely for malicious purposes such as credential harvesting or further malware delivery. The presence of multiple compromised CMS upload links suggests a tactic to host malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://infrive.ru/uplcv?utm_term=what+do+the+fullmetal+alchemist+characters+think+of+you+quiz PDF link annotation
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608163d296d15---47398445914.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/21939749730.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/welafid.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/38201844d2efacefdc0248355342c819/3784910305.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/xunazoxe.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed2b51ea2b---mepefofosuruzobipizij.pdfIn PDF document text
    • http://rld-carbon.ru/file/wimiputekotap.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/81792440506.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/87658778106.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/319ab1332ecbbef1efb2400d7aad07c8/kujixatodosatenuzo.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160984b1028933---keresivuleguxita.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9e5a80816---bebozogut.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/8884501f755d29b9cd4a44d923c844e7/88482490846.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/zovisamaj.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/gawometunovumuporosarib.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a685322d2db---47337116420.pdfIn PDF document text
    • https://isosklo.cz/uploads/16544980504.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/9a3f1b1073efa68a39ecb7bebc9513b5/7626704997.pdfIn PDF document text
    • https://andhimazhai.com/images/files/bojawefunerejefaxusajuv.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/a2f584faa794ef703288a5339c5e2e59/lisaji.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/6484842140.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/bc7321fc88105d380645ac3000d3a886/tuvosepudokexulexogef.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c54c1adab8---dajotebepajewida.pdfIn PDF document text
    • 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_off0000c404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC404 16972 bytes
SHA-256: 069cbf9da1c63543aff679b659607b064cffdde8ab8526a28ee6254cf19b5436
font_01_sfnt_off0000f05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05E 11248 bytes
SHA-256: 7502b588dfb8ebd612af6717a22e540e742a27b7c06e6edbd965281511311463
font_02_sfnt_off00010a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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