Malicious PDF — malware analysis report

Static analysis result for SHA-256 5865ac675cf5b441…

MALICIOUS

PDF

96.6 KB Created: 2021-07-22 20:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cb7389280b5869718c55eb0cd4fc71e2 SHA-1: 5ad26ba3c3db9da5172ad878ca86e2fd527a3cf8 SHA-256: 5865ac675cf5b44104888949e314c87e2f2d02a80b77390dfaebf2dcba5891cb
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or phishing. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to manipulate search engine rankings or lure users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9855

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://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2b19a2c5f---29318829085.pdf In PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eca853a282---rilogutilobapo.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021062801070773499.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/0c6bf3faf8647376371deaed9b81963f/weluvotadus.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/80nh8ksrn98cp8i6d5l465eucr/gomuwotaxukerol.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/dutupataxu.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e8b14b6a4---suseravekuwa.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/givudiwefuselabileve.pdfIn PDF document text
    • https://kristinanamaste.eu/files/fumasajorugukalisuf.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/cofqon90dk9jo2f0q9gk3k0690/42859656261.pdfIn PDF document text
    • http://bakoca.hu/files/file/bitusiwawesasaw.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/340a05bd80d90b8fad381f1031cff178/juriremiranujogutokutajol.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/powikajalesatamozegotave.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/59967033818.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/c068a10ce5a44fc059d8c5f71e3d4f75/juzetiboxunudunukevubawal.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/a78fd2da886cf888c386a3c6cf79d28d/refafofuzabilemedake.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/86916000334.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd80307035---25521843077.pdfIn PDF document text
    • http://garderoba.sk/images/_file/91218991101.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/10176658049.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/68080318569bfdaedacf1d1e0d3c0c7e/81985859870.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/juroxomufakajav.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/16488699957.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd50a85cff---60495052426.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/xujupiwisirujusotemufebu.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/18bfds094ntvsipe0f3l78l7p7/gutigexawojal.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/9f83628c3b0c51f0f46e6a5cbeb3ba91/jifufija.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d2b538b6---11887369865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=dating+courtship+and+marriage+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_off0001132e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132E 17404 bytes
SHA-256: 11b214d70edabe7a233811829df299885a108dc8b8ea316f55706102433b7325
font_01_sfnt_off00013ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF1 11120 bytes
SHA-256: 60e3b772f3269145791aa530f8ea9e3ae6aa0874cb6167bffb2bbfd4c4cf1f4f
font_02_sfnt_off0001598b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1598B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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