Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fcb839e46d86e21…

MALICIOUS

PDF

84.1 KB Created: 2021-09-03 02:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e209ca0ab11887be36d07006108cb1b SHA-1: ad21252d2959d46f67c2d9cda90fdfdeaefc1721 SHA-256: 1fcb839e46d86e21ba7d4f211d338566695a57fd7f7ad245fd3ac313f6b03e64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/08f3b8d1c108d613269a1a1554d265b6/27130573619.pdf In PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d938cb377bc---rufotesikenite.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/nekasokibepigego.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/lisigezoji.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/zifapebiwatubodeg.pdfIn PDF document text
    • http://abnicum.com/files/file/12337780379.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/10502931726129f55587631.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/15172000647.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/77114772204.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/2fefea578638b29b528ebd8f2079e9ac/gopefufok.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/fujado.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/13849035144.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e39c097159---5972239703.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/75666158383.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/87252963907.pdfIn PDF document text
    • http://attlas.center/userfiles/file/jefiwe.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/noposinasetujinuwumavole.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949f0a71e57---12143558918.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/89961269968.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/gilafuvubadatudikop.pdfIn PDF document text
    • http://paliukenas.lt/i/File/57467345458.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/zakelolovafelavexisonoz.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d435eb683b9---45437224081.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/66742385393.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/pctuuo5724m7bm8buf8gfauvru/sigisutebexagipisej.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/g32pfstlefudlvkq2dji81c6e7/12740972160.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/afd8fff4c1c11689b2a45a2c68d38b2f/27466700762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=business+law+today+pdf+freePDF 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_off0000e29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29F 17828 bytes
SHA-256: 7d150e956c62d2b995c62ca791beecff574de8e0edfee6647aa03153d777fd95
font_01_sfnt_off0001111b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12932 10844 bytes
SHA-256: 7bb6b3a0171e8138ec4cb2be7591c51d25a0026eaa016a0294c62eeb05f7ab98