Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f70b16f3599d78…

MALICIOUS

PDF

81.4 KB Created: 2021-08-17 06:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 37c56c8805da6029e864ecb96b0da162 SHA-1: d335f6783570cf95c14f414ae31a457e9a5e6da6 SHA-256: 42f70b16f3599d78a7a79c345edb511a4736b5427979b83c789051267cbf780f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a secondary payload or phishing content. No scripts were extracted, but the presence of external links and the high confidence score point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/t6oh5deet149arcokk26mop7op/82050284690.pdf In PDF document text
    • http://maidichike.com/upload/files/tefuxomivejoguvanigo.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/39403313355.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c554686d30d---66756572161.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab77aef1dd---66233462892.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/33418806422.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/posopoluwuz.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210714014719_v8aj8v.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/90913631113.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/0022fc4d64849d23259449a98080175e/woseniren.pdfIn PDF document text
    • http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/38244780000.pdfIn PDF document text
    • http://dade666.com/userfiles/202107file/2021071600555570554.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b80244439c---10987521335.pdfIn PDF document text
    • https://maria-galland.ru/files/file/nudaxixuvefelexigep.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7c6db1921---36455908685.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/tudapinurukulosokanev.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/37622809114.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1ac062866---99216429412.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/dda02971a2f86e132c3b82d798265953/93456544378.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65c17213e4---87886590847.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7390024b9---51684293266.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/96825821275.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/go93frq1vbguug86liqec75rt6/wijoji.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/1dbdd8cc30bc58f3e6783f6fbff23efc/fatutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=oracion+compuesta+subordinada+adverbial+de+causaPDF 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_off0000d81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81B 11004 bytes
SHA-256: 58c2da0be34d43d263302b7bda2d9cb64137b653c759e5133e6dd6541a12c0ae
font_01_sfnt_off0000f179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 17368 bytes
SHA-256: 638aa41b30d35edc73704694e823906ea0931e490a6c25dcb46ff84eaf832a05
font_02_sfnt_off00011d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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