Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22d21f2293faf05…

MALICIOUS

PDF

82.4 KB Created: 2021-08-31 19:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a01611646269bfdbcb0874d847b774eb SHA-1: 42f3d49d574149fc1aa3d8f398dd8540e6fd1b65 SHA-256: f22d21f2293faf05369ce174b415d1d216d2cda8c8253b2811ddee05765d743c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute phishing or malware. The presence of external URI indicators and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://drafthe.ru/uplcv?utm_term=free+fire+download+mod+apk+unlimited+diamond PDF link annotation
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8c5a4f87d---92828222971.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0b1dd6fa0fbe0a74acab3483c56f864/25348103980.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/kirabopijirasarebapi.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/8v4geitb714a8jqfht6ttc3cgc/93627635070.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862fe6930d0---womizemupabejapaso.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/29341115319.pdfIn PDF document text
    • http://wernitznigg.at/files/9248507866.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b60d24cff03---vodarefijepomopalus.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/zupudotobowaja.pdfIn PDF document text
    • http://arslanemlak.come/file/89852225024.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/jijupilosoninogelikix.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/fedomukavowipojelugowafek.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/zakijojomebosutogabepawi.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/44218321894.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/39496990850.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/lijobomoxupav.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/1650706252.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/dt1tp1ui3svb6p85lkaqq84n52/kudumeveb.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/9704747.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/pa9vdg2a0ukiqooo95fv35emhc/45271027504.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e48bac714---nizimux.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/rokarowulugipisikidepe.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/gebawikixodotezoriko.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/tokorejaleludolixite.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebda0bb7e8---bajubaponomam.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF99 20684 bytes
SHA-256: aaf87a8de57f4e5da69b058d9b9f249ab2706f273b94d7ab0f611817f1a1e72c
font_01_sfnt_off0000f49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49A 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_02_sfnt_off00010a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12240 10748 bytes
SHA-256: bdce02699be1bd94d4b7dc8e8f789024088281019e6332b0402f66b4f4ebe39b

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