Malicious PDF — malware analysis report

Static analysis result for SHA-256 7755d795f266b1d8…

MALICIOUS

PDF

87.8 KB Created: 2021-06-18 02:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b93302107470cb38c2a2db8ee0ba675a SHA-1: b1c3383ef71064a59499efd344be2de39ad209da SHA-256: 7755d795f266b1d8c784b547870e9924e2385cbb783eb635d0c11d9d9fa697e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains keywords related to financial accounting, likely serving as a pretext to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/kr7lqpenpeu2v58jpatjdtk17t/jajuwifefumamisakadotuto.pdf In PDF document text
    • http://marmaraisg.com/images_upload/files/85068720258.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/7vdlp2gq2nphq25h7pnkacmaid/potikomirev.pdfIn PDF document text
    • http://yilip.net/userData/board/file/21433634443.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb776d81d7---81850884096.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/1b719b071571a776d64ef7460d28e0cd/kigurimi.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/51360255710ff242f223dac243ad60fb/18803925484.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/snfjovticnjsjdanbk8iu2ih13/98496038504.pdfIn PDF document text
    • https://whitesal.com/data/images/file/1543_20210610074536.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/tetawodi.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/68659297629.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/87925094621.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/psv7ovflk6bt8in0tir1f78hir/19896238388.pdfIn PDF document text
    • https://giustofiori.it/file/54022498289.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/46552286948.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=financial+accounting+book+in+gujarati+pdfPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11936 5380 bytes
SHA-256: 83c1aa46b5a24b70d9dd1e590308fc30862ca4408795587acf39d90eee1d76be
font_01_sfnt_off00012b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9B 11184 bytes
SHA-256: d7704a042e4d69474d8f2282a7c5d5e1c19f2a27c93b4f9422d10caf32bbf3e0

Open this report in the interactive analyzer, or submit your own file for analysis.