Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ed5d568020a6d0…

MALICIOUS

PDF

89.0 KB Created: 2021-09-07 10:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4c1dc9a409c5a22b33349970c01e7d10 SHA-1: 924bd4313870c82a40c0e7cc667e1e263faecf8f SHA-256: 05ed5d568020a6d051e6fb46b6bd5867fa69487db07b0b99a500b4bae793b402
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous URLs, several of which are hosted on compromised CMS upload storage, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bjbtrh.com/files/pic/file/jeserubixuwan.pdf In PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210818_7B5904FC16620D54.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/19525910108.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/044a01fd22da9369bd993fe37c5bec55/lesonulevejizevekibe.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/8qr39vdrjubb3kpjtjjh5nuht7/ropejulivekoka.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/wirosivigiwonekadezan.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/42926865663.pdfIn PDF document text
    • https://megashina24.ru/files/files/labeti.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/lukejigaw.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16083a766b4080---biwolunivawul.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/xapazajobojukasixetajuxaw.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/37173692033.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/a6275de7e16d7b6aff89da67b3ef9ded/dewafofuzujanodokud.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/n1ujkjrsbqikp57a0k7emokibg/melufoxizezezodudonu.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a1f3699e9---lupuvinotemoxifase.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/vagawetegubinedasa.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04f69c9464---liruxemiparuvapetaxa.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/8918206719.pdfIn PDF document text
    • http://myredm.ru/uploads/file/60102802507.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/59475802143.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/95182422983.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/92979651788.pdfIn PDF document text
    • http://schubert-hh.de/image/file/41203640456.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/3338306773.pdfIn PDF document text
    • http://guitarenko.fr/img/files/wexiwekagusekogamim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=kangertech+subtank+mini+manualPDF 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_off0000f466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 18964 bytes
SHA-256: 98e8a7d59c0e051797df02e8aceb2662a3d00e1ebe02e9d0e1f75eb01f9605be
font_01_sfnt_off00012543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5A 10880 bytes
SHA-256: 183c0fda4b1befd6cb72eb133a401455d4ce9ef794fdbb53f4e8b23847a49c68

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