Malicious PDF — malware analysis report

Static analysis result for SHA-256 683474ab7ec8188b…

MALICIOUS

PDF

86.0 KB Created: 2021-08-17 04:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ee34678b559cc1b0217b421c88892a1a SHA-1: 88c060ae3853bfa9ba0a156a282ec80dec923ea3 SHA-256: 683474ab7ec8188b0e6b46e556545f29383867c0903f0b2c848c27c7cb879695
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://viscom.bg/uploads/wysiwyg/files/41245856066.pdf In PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4042c19777---28785581472.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/c5fcrl8d6scet3lndifutr7vuc/39880556246.pdfIn PDF document text
    • https://mimpishio2bet.net/contents//files/piwunibisuzisotumura.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/71628163282.pdfIn PDF document text
    • http://foodchemsino.com/d/files/fumejirodawibogopo.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/52444786174.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f6a1d7f7f---73006803652.pdfIn PDF document text
    • http://faradbox.pl/files/file/65062034961.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/fc9a8189a6f794902aa3826afaef0e82/71749167499.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160782adf3ff3d---8846616757.pdfIn PDF document text
    • http://nsureunion.com/clients/71556/File/58725180125.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/feravufufevukamezunit.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/10250804789.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/99711697815.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/53045865339.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/pepojenolopefutusuwuvap.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/88257112365.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/jawum.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/gavepo.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/vakulitilaw.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/fbaca8997ea78ede2cf444d145fdfebf/jofazukuvebipokitadol.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/74ivkrrnorl83ssgv7qd8tjaq1/45167746791.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba365138ddc---xakidivuzij.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/65198421112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=larra+casarse+pronto+y+mal+resumenPDF 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_off0000eadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADF 17616 bytes
SHA-256: 32593b4488d82d676caa5b37050f7630254666394f11de37c1efe87e40357f13
font_01_sfnt_off000117cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE4 10616 bytes
SHA-256: b71f5a6bb0fd415eeaa6ff14aaf7ac386d34f5e8e0ceccd79adecab8288e592c

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