Malicious PDF — malware analysis report

Static analysis result for SHA-256 8618679c51807db1…

MALICIOUS

PDF

107.6 KB Created: 2021-07-14 01:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7260dbfe53c8db9efe84677a396d9688 SHA-1: 4777b25a10f606c7be7e473899337bb53164f9fb SHA-256: 8618679c51807db1b333e061a8f75f3e755edb49305bc37b2b81a32c51579f76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://garglob.ru/uplcv?utm_term=the+torrent+you+are+trying+to+add+is+already+in+the+list PDF link annotation
    • https://tractorpulling-emmeloord.nl/upload/file/mebebulukelepebuneruma.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/e3f4809418e3b3ec983825e4a162e537/29394477381.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/zewiduvidojiletuvesikawu.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5a87ae58---zotawerojixisurobuvejiv.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/60235846348.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/rapemetubitevexusopi.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/78091237098.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/sumulogomemusu.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/56348508793.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/bezisajowifefe.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5baded1bae---namaguzakupariwuxa.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/7218053191.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6e10b68a0---dazelirisid.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/44430661428.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849c9db687b---27873152814.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7bdaf057d---33804167554.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076084c3bb51---77059832621.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e5adafdfb---53145866529.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/1847850c8be523442cf607acb53722c0/59576270527.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/abdbbed6dma3jd7oj6t21iktkv/71897736197.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_off00014103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14103 10704 bytes
SHA-256: f63dd590858221e82edbc99576b2f449da7a1bc4661899056345d4cbe77141ef
font_01_sfnt_off00015954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15954 17420 bytes
SHA-256: 413b7e36976753dce1a23c35f8d648e98206103cc218710cd3fa961e2e151445
font_02_sfnt_off00018724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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