Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6fceefa323740c2…

MALICIOUS

PDF

71.5 KB Created: 2021-09-01 12:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3a19af2acc332ce0fc5ea744cc7abb05 SHA-1: d78898cf8e2305e120dd6e364237723f6735b482 SHA-256: c6fceefa323740c25b3660cff9e9527e52b8c7da30b5658c0386d4d4e3cc3acb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute phishing content or download further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://smidgel.ru/uplcv?utm_term=parts+of+the+cell+worksheet PDF link annotation
    • https://tennis94.fr/img/pics/files/jitoborofemusid.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/jadulewujuvanitaf.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/rurifotiromovabopiged.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62afe39a0---rotopirop.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609da2a85840e---54588289667.pdfIn PDF document text
    • https://edarky.net/data/file/japukedozi.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609652bf8ce61---16814688291.pdfIn PDF document text
    • http://minhanh.com/files/surifemigin.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/wupokivonoz.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/9e17eb44c08b13d0eec57f912946ccd2/74827768021.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/65282629835.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/40881784895.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/64273953450.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/aklqlos7vkn7j0ccjpmkgs02c7/87336801008.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/segazu.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/pubuvobowozege.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/tukubabijukubelige.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5676c69b1---80153082253.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/5371b39ae5b0a8d50657df5d8966759a/pidapavinadinoloninerefi.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/dexemufamij.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/zedesemufawasedutalilora.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/34617277679.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/kimeponoxaletejetu.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/4slkn7aduge4bdnomqgc2c7ovd/vavidurazupuwodoxofov.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_off0000ba8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8E 14736 bytes
SHA-256: e5a0520d6f152daa89412df73d5d473d98cd1c65b1dbb580d569feadbcffa544
font_01_sfnt_off0000df91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF91 10416 bytes
SHA-256: 39b032a578e9fd88114e86b516bfbcbb5a02006a380860203ae3c21d6413118a
font_02_sfnt_off0000f772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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