Malicious PDF — malware analysis report

Static analysis result for SHA-256 7830a1db0b6ae7ab…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 20:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8b6c647e80aa2e7e553efa0c9301c43f SHA-1: b2bd93645a0a01b161895fe69ef3656e59cae978 SHA-256: 7830a1db0b6ae7ab0d6ea2abb081cdc6a739676b8ec913733421e09bdf233988
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that redirect to various external sites, many of which are hosted on compromised WordPress installations or disposable domains. The presence of 'utm_term' parameters in some URLs suggests a phishing or SEO-based distribution strategy. While no scripts were explicitly extracted, the nature of the link farm and the detection as a 'Phishing.Trojan' point towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://irlanc.ru/uplcv?utm_term=phet+isotopes+and+atomic+mass+answer+key+pdf PDF link annotation
    • http://yugreat.com/filespath/files/20210906115235.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/18f18ee935003ff0243df8aae5896244/bejozozivojoriruri.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/netokuwi.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ihhu6584eb76uno589p7b5295l/99203089484.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6feb5ee738---kesamowel.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/9d63d216d124b4a144c7a6e678f3539f/sabuwiralokijegetewafi.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e81f366d8---10979788726.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/jotijomarolokoxewanolopej.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/340351106.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/21442953087.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c254245b334---panokagulaw.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/3829754254.pdfIn PDF document text
    • http://akssert.com/userfiles/files/84177058243.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/64484306237.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/atudaj.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c645cd27e2d---gorepezelobovawo.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/81700080423.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160771d6176b4c---75087026467.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5030bab93---gaxatom.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a092dee9e5---20319879741.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77e4ead1b0---gibivawudemolanerogefe.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/xiwagovuwobimo.pdfIn PDF document text
    • 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_off0000de68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE68 11132 bytes
SHA-256: 47ad88aac6d142ff6284a5e547180a06fcd874deb0ef466a98bab919bfe1ae26
font_01_sfnt_off0000f856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF856 18944 bytes
SHA-256: a0d0ed51642b7cf062ab026d90c576bb4df1d05ddffcd50e84957666166a31a6
font_02_sfnt_off00012a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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