Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b2405c04308e93…

MALICIOUS

PDF

85.6 KB Created: 2021-07-02 02:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b8c127938d8cf5eb913f61405d3161bd SHA-1: 1d812e217bc34f03d9a69d1222a3696e9fbc8ee4 SHA-256: 01b2405c04308e939872330d8f334f7e6b900f5bb88c7027629506ff78b01510
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ya-ke.cn/admin/upload/99100744780.pdf In PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f7b933fd0---97575313221.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/zudanefapi.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/74744321518.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c178174ba67---45042281469.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d933dca26c---fanod.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/vedoj.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607064d3abdcd---rasaluv.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c30a3da1a---gexama.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/qs52mfmshr06oclrfeug68rf7n/rizoruxovu.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/kukaxopixatimibema.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608de07355f9f---43018965368.pdfIn PDF document text
    • http://sparkpro.lv/content/file/gijugumufi.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/83187423092.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/89972d1faea81bd0456688703df67f46/98575000537.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/60441781747.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/23907766335.pdfIn PDF document text
    • http://coinmarketsuite.com/ckfinder/userfiles/files/3862226637.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/xutalodebutusutadixe.pdfIn PDF document text
    • http://longhornrings.com/clients/0/08/08da48574b41509ac7bedcf2500dc652/File/namikesejalulu.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/2356241900.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/93577563398.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/luzatilivakil.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/84485898681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+do+you+get+legend+tokens+in+apexPDF 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_off0000e8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8ED 17752 bytes
SHA-256: 4882ad9e4c518d652453bec4b4bc088492685c73a25ef7694d8fda21045f9e59
font_01_sfnt_off0001176f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F86 10952 bytes
SHA-256: 5032a949cf0aab57b0b85f3f1f66938e642e10f4351da77ea06f73d8d0488d51