Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17c18da14bd0972…

MALICIOUS

PDF

74.8 KB Created: 2021-10-09 20:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 716b3e8726e8179a5f5d4fb45e083372 SHA-1: 7afc39fbc6ede3f3fc2e82d803c5f33b052b875f SHA-256: c17c18da14bd09722afd34465d8e9006ad993135c617736b444b09ed46e7a403
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The heuristics reveal it functions as a link farm, directing users to multiple other PDF files hosted on compromised CMS upload storage and disposable domains. While no scripts were directly extracted, the PDF structure and link farm behavior suggest an attempt to lure users into downloading further malicious content, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cafepiolho.com/uploads/assets/32717889942.pdf In PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/fowufomib.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614581b5bc717---14280839536.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/didepesoza.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/pufufitofupezupiwojapuxas.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210926123720.pdfIn PDF document text
    • http://cssh.es/img/file/57271783628.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/31073801138.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce71e50602---xelemodepuder.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/8580cb339a614e6cc516b032222cc47e/gepabub.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/1501c7b3d4f4a47b1742baca10c5a217/kuzetozuwudibawulogevo.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/93459329659.pdfIn PDF document text
    • http://annabarons.lv/files/files/96325189969.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/babufunebewofazakonadi.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/19356279204.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/19215929564.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/dubolewujulenu.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a35f406d06---93310174812.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210914031144.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/67819340405.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/dilijosijemomimutazud.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/bomukidoxukuwikurex.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/78013285266.pdfIn PDF document text
    • https://togeltop.net/contents/files/gojijazot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=red+cabbage+braised+applePDF 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_off0000c0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D8 10552 bytes
SHA-256: b2436905bd2893897e9040bf1b7becaf9138f6b32ef387eac5b30cd395c12af0
font_02_sfnt_off0000f07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07D 17844 bytes
SHA-256: c6d8973d3137e5df46a7f25e202e23ec7815c95a56f9645af51a5ba79d19f72c

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