Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c12dbde60da0ae7…

MALICIOUS

PDF

87.7 KB Created: 2021-09-15 10:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a18db5e303e7659af7a91006881752de SHA-1: 08ea824fb78757a57ff16bd3e7d4614e4aba2775 SHA-256: 5c12dbde60da0ae7ddb0c23c7fd34a5f527063a56b0a5c9998b622e7363df588
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pixomot.ru/uplcv?utm_term=how+to+customize+your+app+icons+on+android PDF link annotation
    • http://ig-einheitsloks.de/medien/file/81349169627.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/padugujavigagesesuzo.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/60643551372.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/56553849428.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613065e20e124---rimejejopuzunelabiv.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/79525361197.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/mageno.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/90770080852.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/94870666271.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/bekilusofuxika.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/masokelezivovufuzem.pdfIn PDF document text
    • https://ghnservizi.com/file/42739283469.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4191a65bf07c1a86921f20ba0be6639a/tutibovifesakimo.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/segagozu.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/zexepizotag.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/35826340168.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/weziza.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/44419543883.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/wediputomifo.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/2018165591.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfdb4c0afc---vorijepaporap.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141629e55b09---bevifamenodu.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/gewijolakafabalizewoza.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_off0000f18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18D 17668 bytes
SHA-256: aa5663b024b28e168b42f3fd70d9873d23b24ff0eb87a96dd812221a97745c29
font_01_sfnt_off00011f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A5 10980 bytes
SHA-256: da71e5d9d05f18f9ea72baf4f2a8b18abddbdbd53f1e9d76bcf4d7c9ca33f4a0