Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d1b7af855179226…

MALICIOUS

PDF

95.2 KB Created: 2021-09-16 10:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 37cd274b779fec92d2cdedd6688d6e01 SHA-1: 29e94410d7288163e8850bf9fc3be6aa2a4169c9 SHA-256: 0d1b7af85517922640412e71650718020cd0f8c40d131db286c12486ca35a4c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were explicitly extracted, the nature of PDF link farms often involves embedded JavaScript to facilitate redirection, suggesting an attack pattern aimed at tricking users into visiting malicious URLs for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://travelci.ru/ckfinder/userfiles/files/wufumadazig.pdf In PDF document text
    • http://yuli-china.ru/d/files/pafizunizovafut.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/lavajopuzu.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd8c2d07ec---39676711011.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/nkrfjpd4o1qp7rehq6s1kt3ujv/21717378718.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/40140185139.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/14819773155.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/24249962263.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/bopuforuxosuvilezusaxiba.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/51500084715.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/22854651254.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/62778337178.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/vujipero.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/86439104390.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/budovoriniwelizi.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/jituzifetatevaduxono.pdfIn PDF document text
    • http://gibisch.biz/files/files/xivuwibuzokizodozaku.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/1784915365.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422e5c2f9de---10186370256.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/juvesitiriditedimavaxo.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/fewasuxofowekovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=restart+app+for+androidPDF 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_off00010e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E93 18548 bytes
SHA-256: eaf04f4f34c30101df46bb89dd702d974c9aa8b387595128cead129d89ff285a
font_01_sfnt_off00013fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBB 10492 bytes
SHA-256: 8f02d55a77441e0b3329ce4b7b60c3ee307a75442ad4f317e15f8f4526509d14
font_02_sfnt_off000157b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1