Malicious PDF — malware analysis report

Static analysis result for SHA-256 d144f781eb5d7990…

MALICIOUS

PDF

83.5 KB Created: 2021-09-02 16:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 476d12af9b0a16238d6134bbf65bfa21 SHA-1: a51c94277103e2af974c11149717575f2ccffc11 SHA-256: d144f781eb5d7990dd4c3385eb01fce7ebac908ceceb322d61d14dd4e150e8ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised websites. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://dok-vo.ru/userfiles/file/wisegotufaj.pdf In PDF document text
    • http://hyeminshop.com/DATA/files/tozupap.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaa109c32f---malamavute.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b22bcd8c8cecc1f0915d3e2d445cbd72/71569033126.pdfIn PDF document text
    • http://aven.su/userfiles/file/sufag.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jibukajidozomopusiwumibig.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/27748571731.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210826_35F07D7FCB87A45D.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/48517440842.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d89b319607---44958795677.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701aaf27d0f---negulaxifa.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/kipixagu.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/pa0nrol8neml4ba0sq87qm2kkm/8148577236.pdfIn PDF document text
    • http://angeladaniel.de/uploads/files/tajudogemoxokekovev.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/kazoxibigoxugew.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/98835145510.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a27c0bdbacf---17622364655.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/ans081mksk66bkb2ho3iauctur/zabekisas.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/sezus.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/fifabixibaj.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/8434831899.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/41360035829.pdfIn PDF document text
    • http://sdes.in/uploads/nowukisirebazenafaruwa.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/rudefuvuselo.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/e775910dd29a39580af3adc4e1055b65/92870915326.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ttlspkgeg207ebeldsg1h70a7p/gumupowetedika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=convert+html+string+to+pdf+pythonPDF 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_off0000de44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE44 18488 bytes
SHA-256: 36642ac1004ff23e175f89e02adc34f4899d5d6ee4d97bc947b95b4d813b99df
font_01_sfnt_off00010f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0B 10992 bytes
SHA-256: df75b70a72fe7b12b50f4304ec5f8a7e3736aa26e70c3d10b4720321c2cc2cb3
font_02_sfnt_off0001283a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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