Malicious PDF — malware analysis report

Static analysis result for SHA-256 b341c0071f471e58…

MALICIOUS

PDF

81.3 KB Created: 2021-09-05 23:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d50e547ec22c565cfae7368f2cb90adf SHA-1: 4758a4afccb13231eb124b732de5ac5e1aec9a36 SHA-256: b341c0071f471e5899b77feb454be7cefcaaa2bd9dca7a8de3873454203bf2d9
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The primary purpose appears to be directing users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://mini-garden.ru/userfiles/file/rexedexazejunufodexapizaj.pdf In PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/44b127db4f1df5ae2d5d8ccb1a11a0a0/latelipisorolalo.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/85542972444.pdfIn PDF document text
    • https://asiajitutop.com/contents//files/pidedijopol.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/13628202008.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b568a9ae227---xupegumawaparukiwonipakim.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a2547eb3b88645a9da17c8ef9f863436/pusigudofadikip.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ce1ab8b35---lemuvis.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12ab17d511---ferawedono.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/81535061682.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d696b7dc2---kipazetapokuwarigoresu.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/77538079100.pdfIn PDF document text
    • https://phukienbep.net/media/files/fabenugixopeg.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/ruxujilumusu.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ba99209f1b1---bamoko.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/ac8ccd093eb66f60b734622401784ab4/83564486000.pdfIn PDF document text
    • https://fotovipvercelli.it/file/gidavamesem.pdfIn PDF document text
    • http://4bx.pl/public/file/98757298561.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/b0d00523e78b9ed9021b594ac14c5582/jawej.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/2956badf13ac833677cd5fd5f1e308f5/59480858339.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/lubevodemeg.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/gomagiwezuvavawufirubeze.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/rasitegixagadolozuwafen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=world+map+in+english+pdf+download+freePDF 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_off0000d897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD897 10928 bytes
SHA-256: 203c03f0a4d34ac128c83839d5058261d47ecb3dacdab7c8baa8de271a624095
font_01_sfnt_off0000f170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF170 17764 bytes
SHA-256: f2d37c0670c885fa17085c52891a809201c2bab119847bf4207f961ed10a0642
font_02_sfnt_off00011f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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