Malicious PDF — malware analysis report

Static analysis result for SHA-256 773b89a8e028fdec…

MALICIOUS

PDF

90.3 KB Created: 2021-07-02 13:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ff9636a0405c3626379e56b9a29704c8 SHA-1: 07af2d8a2f56b58b5bfb5bbe78f5b67f40efed26 SHA-256: 773b89a8e028fdec22d338e30f55eaaf01fa35877887d7bca30ec4769ff39249
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external links, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=witcher+3+end+up+with+triss PDF link annotation
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/k6fsnvad4vrtufi09pcsu4sa3s/98709185626.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/bmelagq7r9g3g9lgmlds2jf31j/gosozev.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/juwobufamegirojejexololer.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/lunisajavamuzubatemelise.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/lf2aibbkpjd6dvhm9kd5ugtd9d/jomisivizoso.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/8629365645.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/47759933907.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/62024579977.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/fc89e27ec9d5af5f99484a380e9a4e27/suziditulalatulegowotupol.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/dqdc3b4ehio0hmo0doscl61j3a/mugojavononuki.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/funaru.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c784babfeb---82965002657.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/s4f9dpjbnqfkiurjph63pdt5k7/70291145510.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/pufujo.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/pajepebemoj.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160903fba2fb3b---53546920262.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0ad967ab3---wojikume.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f66e314e9df6a062175491fd3b2602c6/40138915893.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/j1urfp31bp8fe8od3qh1ggpok3/9158332408.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f87d7ca4e9---xavage.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/biwowosepozilufesat.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c90e22361b1cffd954789079629fea7d/zedaniwujagupevezez.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_off0000fd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD64 17652 bytes
SHA-256: 08369c7fe30bcb1bfb38c62dcee6653492bc83c6afe70420616ff8a84275d98c
font_01_sfnt_off00012b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001439e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1439E 10636 bytes
SHA-256: a27a9fbc506f19c91f0695eee8db62ee6f7af629017ef4afa96ba754a398b8a2

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