Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8767b7dc7cf02bd…

MALICIOUS

PDF

82.6 KB Created: 2021-09-14 14:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ed3d12a9693852bd3d371349443cdba5 SHA-1: ab03a1892b74051f0557533f7e1fdcd4ae560736 SHA-256: f8767b7dc7cf02bd881a4ce38a7a3e0f5f874c219834959c4e80d0c9aa0665d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. These links likely serve to redirect users to phishing pages or download further malware. The document body is unreadable, providing no direct clues to the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://polaryachtmanufactory.com/res/wysiwyg/file/lovogiwutij.pdf In PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/57354550293.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613195783a3e7---73221055884.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/3287346709.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210911175057.pdfIn PDF document text
    • https://msiutilities.net/documents/54364603549.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613baa2e373d5---88582896308.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/5d6sqg7icjqgv5mclf9pham67g/49721095749.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613642cf87c2e---99839072615.pdfIn PDF document text
    • http://hibertek.com/image/files/20210912_012924.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/mepojikeked.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/kigesodutuma.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/4216790361.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/sugosirozasune.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109092307017154.pdfIn PDF document text
    • http://186086.com/upload/files/7340478955.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/borepoxaluzulet.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/tenewagolevopibus.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/pelibututuso.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/011030317080.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/30333106903.pdfIn PDF document text
    • http://espwireless.net/uploads/file/fagufobedibevufujeriwepab.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/lowelotubusawigujelulos.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/rizipixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+set+ringtones+for+certain+contactsPDF 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_off0000dfd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD7 10540 bytes
SHA-256: 51b8fe3cedd78b902a37cc91e95b32aa0f46cfebea6d6b3a8f655613ab6ad534
font_01_sfnt_off0000f80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11021 16980 bytes
SHA-256: c4cca41e6d7aee0a79af07ec423daf307bfb0d29937bf5a377841634b63118b5