Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8a4f75c6be8bfb…

MALICIOUS

PDF

87.9 KB Created: 2021-09-14 03:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 830f17d59596c346494738eb67fa65da SHA-1: e7e8c6e89015481f0ee2d2819db78934be5edf9f SHA-256: 9c8a4f75c6be8bfbd6d51e11ea226bdd0d6acc0d3ad30385b58d304acd888423
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=watch+us+online+for+free PDF link annotation
    • http://dentalclinicbangalore.com/uploads/27518632635.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/falidizafozinapusefuxana.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/58957280771.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/21518285703.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/zuzeropugajixawisawar.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/sapagabopepemusuxiw.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/sovon.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/69350555264.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5716a40c5---puwidajejapitonoto.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/92516412920.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/5867807446.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ir10g36gkp2hdfeh9dff2j5421/62098265401.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/tojekukaximesisezez.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/xiger.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109131925566290.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/ridarug.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/fepigikemevinakotij.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134d3f23e7c0---zatomeregeburavewodofo.pdfIn PDF document text
    • http://artospace.com/pics/file/fotejesetafalasatagi.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/97584608834.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/50755433649.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613260d0dc73d---97319583440.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a190a7ac89---migib.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/tasiroxonosudapawibe.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_off0000f183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF183 19104 bytes
SHA-256: d13a46abfa8c477a47c9e1a2485a73204caecc932b398829ff036f590585b7be
font_01_sfnt_off0001221c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A33 10528 bytes
SHA-256: 810570053b7aa5e577b10584bf08b424d0887172c1b634516b60e2166b7fbd0b

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