Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ba5ad5e8873daa…

MALICIOUS

PDF

91.2 KB Created: 2021-08-12 12:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e18a6ca8fd01850ca83b77ab2ec89e07 SHA-1: 37bdf0ea7f4825675d9d76d7f45095f023274b6f SHA-256: 77ba5ad5e8873daa58c20972443a5150f05e89fc2cc03fc27b835e7886a441bc
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload storage or are hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://firmen-bekleidung.at/userfiles/file/wulokumijufisilemuvi.pdf In PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56fbf27eaa---muzemuvifunakasunetefebus.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/lusukijemalowesotupakuvi.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088821ed0733---7148197303.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/bafaguzidokivu.pdfIn PDF document text
    • http://museeducuir.org/upload/files/40530364972.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/7cd40182ed37bdbae62296af342a27d5/68351461520.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921714dbebd---xobalolipo.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a562201e00---muruzikarelisuni.pdfIn PDF document text
    • http://salespate.com/userfiles/file/67369330607.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/4c3f5998af71465a4c8da81e4b33d14c/56057894803.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/48852072945.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/12027113269.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/pexurapiragezin.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/88489081244.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/vomunijuwerobafokikiv.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e47b43cb3---leloduxo.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/79132284699.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608201ef7fc2c---zaxederam.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce0708e7d8---widiliseb.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfe7051f13---puzek.pdfIn PDF document text
    • http://rfamilylucas.com/clients/73238/File/lukukigowafozadozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=is+frozen+steamed+broccoli+healthyPDF 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_off00010086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10086 17448 bytes
SHA-256: ff1c0ab1577b110701ba042e0426e30f0cbb98d13b0a7b8f5ce68da8f310f5ef
font_01_sfnt_off00012ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14604 11008 bytes
SHA-256: f5ac622a8ccd0563b82520cb42ce170ed4f2737ba5f2f27d8a94f9fa03259c7d

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