Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6083157b37e386b…

MALICIOUS

PDF

96.6 KB Created: 2021-09-05 03:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b78c38550aded6b05fddaae9ac0e2d2e SHA-1: 27f43ad3aa17c0259abcd49047c1c3b1c081676c SHA-256: c6083157b37e386b759f0bd41f0e63c423c1ccfb0f975d92635c11163332bfb1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely contains malicious content. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised CMS upload directories. The primary attack pattern observed is the use of a link farm to direct users to potentially malicious external resources, which could lead to further compromise or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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://dolphinegypt.net/userfiles/file/xumadifiwodugekuwi.pdf In PDF document text
    • https://inverpalmas.com/aym_image/files/keselu.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/dozujekanezokadowizas.pdfIn PDF document text
    • https://anakmeong.com/contents//files/moliwuwijotitejorik.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/498bfae022f5294990edd2e9daeed1fb/76851762986.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/62151994398.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/31507719901.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/51015532418.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/gumatogetukodinisezez.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/96844219844.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a1eada258---dozokuwajiziwa.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f2785d08a---somud.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/wuvusu.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd95e12eb25---89988414837.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210715224921.pdfIn PDF document text
    • http://fastgood4cheap.com/clients/4890/File/74026823346.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/290509049.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210603/file/16226872807887.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/6961177306.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd31e457b8c---33614458442.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/27909642271.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/64276228508.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/69255a5d6ead437b3b4931011755a536/6792113487.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8f7a1256b---84386310594.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/vinuzu.pdfIn PDF document text
    • https://makenie.com/upload/files/73688786741.pdfIn PDF document text
    • http://df-foundry.net/d/files/30401964379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=bank+company+act+amendment+2018+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_off00010f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F17 19212 bytes
SHA-256: f9319eee24d40e86b80daf3cb774326bbcbce32372cdcc953cc11f8c6afa73b2
font_01_sfnt_off0001421e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A35 11136 bytes
SHA-256: cb531b3dd118c099ed5e03a0201cf76ce371f5d514b8a397d9e8a4103c80842c

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