Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a685c12893e7640…

MALICIOUS

PDF

73.3 KB Created: 2021-09-02 17:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4487ce9b1cc82680f9da712a2c463c3f SHA-1: 167217f2c48c08e18f09c4124f00f0acb07bedaa SHA-256: 9a685c12893e764065a989765e021b642c00a256e821ac675936dc2f73db0491
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://poolpoint.be/uploads/file/ledezasefedonufame.pdf In PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/0d10qamdmi29e413mairk4bo4g/98981469668.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/74678667463.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • https://menu2uplus.com/images/file/mogifukirawodizifofip.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609569954318a---93189151968.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/ne049k2junhftfmir0cnl9fajo/voduxorox.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/76136374616.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/54967733637.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e77726e381---jiliguwoxawavosabirisob.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/45510674324.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210706130703_umnb3j.pdfIn PDF document text
    • https://digireg.org/upload/95000466710.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7b1e9011e---rewovafeborozeviv.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/49123017289.pdfIn PDF document text
    • https://computerzone.pk/file/5540243533.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210713_185850.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/ta8jb5ha0eglk6p4u1o9k9tq20/riliserol.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607062ef52dd1---67146833541.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/zafetovepodokexen.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/32041593684.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/riremifabubulerulew.pdfIn PDF document text
    • http://dc-3ed4d7413bdb.prshots.de/uploads/userfiles/1629700110/files/dusepinumitofafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=cost+accounting+a+managerial+emphasis+15th+edition+solutions+manual+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_off0000b80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80D 11384 bytes
SHA-256: 184b59d6187b58d180225721646b16b56a80bd97770e1e06990c54a22344970a
font_01_sfnt_off0000d28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28F 17152 bytes
SHA-256: f33603ba154db02dc17936dce9aaa5a20659db555e36e1ea23c9ba45abb9b8e8
font_02_sfnt_off0000fed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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