Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3976fc981a33bd7…

MALICIOUS

PDF

83.5 KB Created: 2021-09-10 13:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c369e767bf9b9c3e174a2742adc26de1 SHA-1: 4b6508efc7766f1fef05be115b870f1de3abd130 SHA-256: d3976fc981a33bd7a39c6bfcce63599a745cff0c6064a1b99b34d4ef974aa3eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a phishing or malware distribution lure. The ML classifier and ClamAV detection further support the malicious nature of the file, likely serving as a spearphishing attachment.

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 http://hodoan.net/userfiles/file/tenifijuwazi.pdf In PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/dosiloted.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/55080630165.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137102c508dd---22650434805.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/botuxanenazawebelurelo.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/63229787104.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/xowapawotoxoxedepotep.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/16251388114.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/63670767014.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/marijulogeginen.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/60254990662.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-2/20210902111619459130.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/82228023437.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/42999891287.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/65610930544.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/59761388927.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/ririgu.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4b911153b---mamarevexisejepozenakimi.pdfIn PDF document text
    • https://equimat-cheval.fr/file/12434115945.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/c54a7741475dc7a1a43d845c84078c05/bepunojonetaro.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/54195593344.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aba5fc9151---46978538668.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/fizonegolidafoteb.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/dadowujemevowom.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/85445513077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=android+ftp+server+appPDF 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_off0000df39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74B 18812 bytes
SHA-256: 5138e06770d4aea58707d5d4b771d6b6d2aebbc096efcecea869456711370da0
font_02_sfnt_off00012803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12803 10492 bytes
SHA-256: 466dd5eab5c929c39ad2418f3b7ed197963fcf62269abde8f39be252c1d5fa73

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