Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7ae1ce4d83dd1f…

MALICIOUS

PDF

78.0 KB Created: 2021-09-04 19:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e45169ddbb963f9b0db1e40147dedc9b SHA-1: e37c0a1d3161ac98830761189df6d41ca6154eb3 SHA-256: cf7ae1ce4d83dd1f758ad3f25dacf2f84545513c4b91c606417a01de6d487bb4
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded links, many of which point to compromised WordPress installations, suggesting a phishing or malware distribution scheme. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://technok.cz/wp-content/plugins/super-forms/uploads/php/files/78fcb13a1a4e3a12ed2263ed0e4e2c70/subifazawegodosexif.pdf In PDF document text
    • https://maturana.cl/upload/file/44707569678.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/sqqhgapuboggjicftsuau5lh7r/viputizemavemud.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a340279b2---jowaleteluwelef.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a9452a60---dunobeve.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/80597555756.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/soxiriwiwuxejewiwolegekug.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/37587977153.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/afa7a17a8b53db694568d4de6f28faf3/kesiwinuguxewalel.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f39a8db4b71---18754310952.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/sogozok.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2976420e7f---filokelajojosapibevudules.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/14m4o6k07nnbnl9fa4g34iouq8/2230200436.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/46448122377.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/a27vgh4ouup0j1jf0moh1ia4mi/7526351649.pdfIn PDF document text
    • http://anupbolivia.com/images/files/fuwokajurilekeze.pdfIn PDF document text
    • http://banquat.com/userfiles/files/zutinibojikidinewo.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/69030200258.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/38662043880.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/52904987338.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/53811164284.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d4941dfb---kadoxurupaso.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/lozupebisetojimef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=introduction+to+securitization+fabozzi+pdfPDF 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_off0000cbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAC 10820 bytes
SHA-256: 353582ec94c46b10d73449818a2483e66ca954b7d66e88afc8fea53db35d83aa
font_01_sfnt_off0000e49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAF 17508 bytes
SHA-256: 1cad632014c36d2af3cf574bcefe7c9923ceab9218230e0137ae27ede059128c

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