Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09aebcd5e3b7c38…

MALICIOUS

PDF

76.4 KB Created: 2021-09-17 05:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: acf0e95343e70b13f9cd41cff302c511 SHA-1: e1f091dba702736ec6458ad747046e87a97652fa SHA-256: b09aebcd5e3b7c38af59dd5f6b4b94e7052e8c0ee28a3ac15963ddb6537fb3fa
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://laborke.ru/uplcv?utm_term=double+dragon+android+apk PDF link annotation
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/7014e1428e25aab7da32ad553bc6b0bd/87747994426.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/lidibupojozafuva.pdfIn PDF document text
    • http://www.farnostbobrova.cz/ckfinder/files/vonujidorawisudupope.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/65724753947.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/paburejenonuxomolijox.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/xulumemigawox.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/tebibufisupuj.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/pilekazitusazodutuwamir.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/5221ed7ddebb93fc47802257d90534c9/8854201085.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/31748090217.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/gotopanudepofew.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16132f4a39ac08---94798905328.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/wawumerom.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/rimikegololitinijimolex.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd8ec5e2d1---47710462441.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/78058599014.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/saxavatuzexijujoredure.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/vilizadojoxawaserizal.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/rupufevijukilig.pdfIn PDF document text
    • https://proia.bg/userfiles/file/11937127206.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_off0000c4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C1 18484 bytes
SHA-256: ee48f0cfdd4500e940c4a9f059d0e838bf47ffd4ff4d87caf27df2aaa072f4d5
font_01_sfnt_off0000f459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF459 10636 bytes
SHA-256: 75642cdac073e01cbc94f4b513fa9c710dbbfca90c320508770a623bb45a1ab1
font_02_sfnt_off00010c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1