Malicious PDF — malware analysis report

Static analysis result for SHA-256 a406a795193611e2…

MALICIOUS

PDF

82.7 KB Created: 2021-07-03 00:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0ff56e935bd5a06468623db4a9c469e5 SHA-1: 29a5fe1dbbb0e84a4eee52a6826c70bf61da3f2b SHA-256: a406a795193611e28fb70902fb64ccc6b70a22da78bf3fb5108eb5fa5817bdf7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous embedded URLs pointing to compromised WordPress sites, likely serving as a link farm to redirect users to malicious content. The presence of these link farms and the nature of the detection suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://coretry.ru/uplcv?utm_term=unusual+chess+openings PDF link annotation
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ko5fscem7pkv66cn6g7no29ps1/84876238407.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/699f7cf21386366906e731e155b7a990/zikevowajaxefejelagadewi.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/99744369805.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/53678662848.pdfIn PDF document text
    • http://guowangcable.com/d/files/50004530695.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/noruvizewonu.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1621867632.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/b3nb5ocrsbqbd6cv99png4tash/43773100118.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/40843195479.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210526083548_2078487139.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/a63abfdc5230f0878e6adefd7d8d9f09/12801681458.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091af475ceec---89077660630.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/vobepuf.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077009d5c1b0---fokogupadopoj.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/a3tbfk7kcsu9bdm554g9hc8bdc/wipoponadidubaxeparofowi.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/2knh5dp59a667e5291e3ri69g6/60627408941.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/bukizimuzoxibanobudoxe.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cde4231ff7b---10842682480.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/voguroxaribawawerarujaju.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c4f97724c489eedb5c9e5b07716e45f3/nosir.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_off0000e3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DF 16320 bytes
SHA-256: 575ea7456cd410abe285a7398f814740e2606d2167d9fd91a456998db3440a71
font_01_sfnt_off00010e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E26 10560 bytes
SHA-256: c6fb11fb44723ef53edfa78fcf2249a6a33359a638596efcf4b24c8d9c14e315
font_02_sfnt_off00012623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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