Malicious PDF — malware analysis report

Static analysis result for SHA-256 d281a445fa52c414…

MALICIOUS

PDF

89.5 KB Created: 2021-09-17 15:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 44122f8b70366d166a708483d4f918fb SHA-1: 5a0297a7512cee2d80afb464581b06544ee6bc9e SHA-256: d281a445fa52c41482dd7e0d3581e2dd8b9fa66d9ca473fb7a64bd6dfd317c93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV both flagged this file as malicious, indicating a phishing or malware distribution intent. The presence of external URIs and link farms suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=cruella+movie+123 PDF link annotation
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4d48555c167c3f47e6722fe2047636da/27636313377.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/75102295789.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/sazegiwuwafafiwegeniga.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/59615886396.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/82889755440.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/19245965442.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/4684307342.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/nesonazatugikuzudit.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109152357088020.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/98059209472.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/votuxojomup.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c596ea8df1---12837802131.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/jisaxonenigidugikasuloko.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/19905687739.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/suligekixiruvilawituwe.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/468102bdaf395264f8b497df355bf943/rumeparasilo.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/sebagitelifawiroma.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/varubazekuduwowusuz.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/ninepokasadoleweruxika.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eef47a3c2b---xidovisatuminunol.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/17036449602.pdfIn PDF document text
    • http://4darchitecture.org/img/all/24199970856.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_off0000f638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF638 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4F 10440 bytes
SHA-256: 45baf5a4020eb4019035399564c0671d6bcd719017830ed5bbbc65fc32631f8c
font_02_sfnt_off00012614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12614 19312 bytes
SHA-256: 3b50cfe0843fc4d4ced0eee1cd6a980c10ecc3bdc0f50acc323d2809e0e81322