Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e06bead0de81aa1…

MALICIOUS

PDF

90.7 KB Created: 2021-08-05 10:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6809be41a4b8dc85d0032f69c8c0a7c0 SHA-1: c1046dd286c8951b73ec9ce2e0c9980243f31be7 SHA-256: 2e06bead0de81aa18b7e8fd925935e6e88745c59d46628d06067d98565ba224b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of malicious PDF activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://alimentosldm.com/userfiles/file/roxabapokifo.pdf In PDF document text
    • http://tunesistudio.eu/userfiles/files/dugomulemasivo.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/60642156238.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a075d609a3b---puxidozekexigereziwuzubi.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160869c9601ec8---gemutadekojaxefipamo.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d0ffb4a5e2b2fcc6ff0783615319f1cd/kujobufopavup.pdfIn PDF document text
    • http://gyobel.itpublic/file/garidupudeluvora.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/xadagikuti.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/61323e732bb2dc831a12e6aede343db4/7128920140.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/vdg9jbi2qcirpk3pbkbfuqebtp/36646182117.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16082d5a3a529b---bumojuwesevezu.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/f64cc06c92da907c500c63fdf103320c/pudukumoj.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/30986792449.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/korusokematov.pdfIn PDF document text
    • http://panteres.com/files/files/jinogoza.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/k3sh672esddciv5kdk7lh4dq47/89964049844.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/73573038988.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982f4a27b2b---8914709927.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/pezuwezevavosikupurikun.pdfIn PDF document text
    • http://3asoft.vn/img/files/finabujuzawopij.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/crnehgdrjap6bh7p1kqcgf2m25/64295276161.pdfIn PDF document text
    • http://llux.vn/uploads/files/sikamutejuxevaxopi.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/88454164588.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/21/file/20210521_133433_103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=gta+vice+city+kurtlar+vadisi+indir+fullPDF 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_off0000f898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF898 21088 bytes
SHA-256: f3630ab323d65313e7cb3e5e0174d436339f468e3b8ac1cb8242d93f84526c2a
font_01_sfnt_off00012b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B85 10760 bytes
SHA-256: 2c68061b05498a500d5356688e27b8ecf9e5f1692db36beb0bcd6f9b28c8cc78
font_02_sfnt_off0001447a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1447A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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