Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca83f592f16f6bf…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 20:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 046354af72bc3fc17c851dfa4c0eed32 SHA-1: 6bf5bc6cfba220717c60aaaed2ffe23dc5d6e07c SHA-256: 8ca83f592f16f6bfc48a2a81f0f62b20ff45af3ecb6b6cb275607da8cab9845a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV also flagging it as a phishing trojan. The document is designed as an image lure, containing a single image and a clickable action that redirects to external URLs, a common tactic for phishing campaigns. The URLs point to compromised CMS uploads and disposable hosting, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://chcial.ru/uplcv?utm_term=words+that+start+with+o+for+acrostic+poems PDF link annotation
    • http://www.frank-diagn.hu/userfiles/files/62313873014.pdfIn PDF document text
    • http://elsped.hu/files/file/mefubo.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/65166402805.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/puvedipulekiwulevinisuv.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/jududegexipur.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/zutud.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/laxeduj.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/52306560829.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/80897829235.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/rulupi.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/xujumobegujaxurumudis.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/98600353999.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/16759171759.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/c76ee1ee8e631463c3f3e25b7d557edb/tonetafatevit.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/jelowa.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/17754232080.pdfIn PDF document text
    • http://ge-mak.com/files/25741931782.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210909145220.pdfIn PDF document text
    • https://festacontinua.it/public/file/21246174575.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ffddcc863e---mosegepufafi.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/5cb5bcfdcf2e2708ae169c089b6ff891/xefudowarajodap.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/18893582663.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_off0000afd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD0 14308 bytes
SHA-256: 8ef4178ec561ef2d5e74edbad3201ad65906765a5aac94f42e644f7acf863fd9
font_01_sfnt_off0000d38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA5 10812 bytes
SHA-256: fd22274ab22addbd4d7771c476a0b89a952f57dcfb9363eb1f97341daef1c4f6

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