Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce41364092aeeb8…

MALICIOUS

PDF

90.4 KB Created: 2021-09-19 10:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 80fd5d4909b37cb7e84f04ce4f30f476 SHA-1: ad34831ee465b4befcd06c95fcad6cbd325a77f0 SHA-256: 7ce41364092aeeb8e8f22eea9ea4e9ea5a5ca236334bfce0b7c43e956c5c2549
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to potentially compromised or disposable hosting sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://karinameal.ru/imgdish/files/3407541760.pdf In PDF document text
    • http://thaide.org/userfiles/file/sapaxegoribegibosu.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/76472826989.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142db338749b---salazevilof.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcccc6ae6b---gokomiwoxajedagekumi.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/13357109891.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1bce61677---74340880008.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369381429b3---74344963153.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/wetofanaxetupovuritozuma.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/xokinu.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/1986839327.pdfIn PDF document text
    • http://18554080.com/userfiles/file/jojomopusobopom.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/vekokowizilepozojeredekes.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/sekudidaxevebofowinigok.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/fokinivugasofogozupugev.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/d63567ab8e3b186e4455447ab69c1274/bopirixotot.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/53279744058.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/rozekarajimet.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/91528915639.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/9ffe116a56c17ad1e26242a2795880ee/lukekupenatipapuxoxu.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/misimuxibonadabexig.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/56951116208.pdfIn PDF document text
    • http://a899.net/userfiles/file/70776466042.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/79157226974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=best+mp3+apps+for+androidPDF 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_off0000fe64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001167b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167B 10840 bytes
SHA-256: 488813df114236cdf8f721230bf72e606c1283586f4b7db7b9c940221d594a58
font_02_sfnt_off00012f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7D 17256 bytes
SHA-256: 9543f8a0a3417ffd933a5c2f708eb2c1a3f52b4b1b9e105b684813d9e1acb851

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