Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c84ce5de01f5ed…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 21:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 347d2a3a7fa28e81ad9c487c93313c76 SHA-1: 0a6e012ccbf1061325f5afb556733f635d86be67 SHA-256: 31c84ce5de01f5edbb2cb4d07703e66ef143a8469de4ebcda4dffc11418f3cb5
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and compromised CMS upload links indicates an attempt to host malicious content or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=world+3+mod+apk PDF link annotation
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614580b52b838---datuwipavi.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/giwesa.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/megefexosemiz.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/66294987400.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///negenowifilujeta.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc12ba4096---rakabegajariketewafor.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/wamopenulewogiwebufepugad.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/14693002624.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6fa31e5fd---tixeragazinetena.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/litirimefawirobumiwel.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/69942958274.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/venujeles.pdfIn PDF document text
    • http://i-physiology.ru/upload/mupomakefebet.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/kodofutuse.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/57796195194.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/lemezijafu.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/57666247833.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/37705806379.pdfIn PDF document text
    • http://mp-journal.com/media/file/81331727957.pdfIn PDF document text
    • http://school15-tyumen.ru/f/disiritotuv.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1630536491_fc3858394d.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/28991199688.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109130428133716.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/fagebazebe.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_off0000e44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44D 17360 bytes
SHA-256: 295a1a26b6509f878454bace3574fc996690fd5891c8d296bbab53aad55d9775
font_01_sfnt_off00011108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001291f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291F 10216 bytes
SHA-256: ca6db58bdb427f1ef758821df6e246e1c2fb0c65b973eaf2d78344c6711e5e06