Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64c898045faf31a…

MALICIOUS

PDF

74.0 KB Created: 2021-09-04 16:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0761b46dab9f9536f45ddd2989e96c38 SHA-1: 89865a57cb75716a26ec840018aeae44f1a4865a SHA-256: a64c898045faf31a527c6bee22246edb94b147da642f314afca19716bbcae77a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised websites or disposable domains, suggesting a link farm used for SEO manipulation or to distribute further malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://bodegoncriollo.com/userfiles/file/tolakawesurorup.pdf In PDF document text
    • http://megalaserasia.com/upload///punanusuwukigelebi.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1609005a822c17---miwubebidibiw.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/zebepemupakuwuliroxite.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/potegiz.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/471d0887d15a296e57c8675f8303c628/63534649027.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/sonosuma.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/27309116623.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/texibimaribubaji.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ded528ec4cf---goladikepi.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/97391636384.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/34168459008.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6de0119d5f---xezakorijorop.pdfIn PDF document text
    • http://canoeing.by/pics/files/tomirakogipubare.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a260f942bc78b3be479ab849de45ac57/nezagelupezupame.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161217a114f7ee---13698002699.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/zutupasurikekipumujibav.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/39751896485.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac36a81db4e---jerujobinutes.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607d32c31aecb---satemataxovabujenimi.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12479c78ff---96687910936.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/75710699602.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/domeniwimulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=invertebrates+quiz+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://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_off0000bdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB8 17072 bytes
SHA-256: 2e6b29432d898339ebd3041220ab513bc2cc7a8aeeebaeb31711e3ff1dc86e37
font_01_sfnt_off0000e9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F8 10788 bytes
SHA-256: 44aa019eacf00db83ae8f25c8313e5e9385a32c45e19feee0e1a9155235a0df0

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