Malicious PDF — malware analysis report

Static analysis result for SHA-256 28fda03f249a1676…

MALICIOUS

PDF

115.4 KB Created: 2021-06-27 23:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f88c26de9b73b8505c053752b91ff20 SHA-1: bcf28f6a18a56f974cef1f830da306f8f29cef3c SHA-256: 28fda03f249a1676a43e33ddc48d56ecaabcab19312b233a9254dfbe32a47a24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the PDF structure strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://pmms-online.com/assets/file/limoxotaxugano.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d95853840---58477559767.pdf
    • https://riondene.ch/img/uploads/file/dutoluwigafixusu.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/6oa0omj70knfl610us2kattu1b/semomezolujuvakatelo.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/s2u26cvr97c3frjes0s5oq5h3s/sugavowonuwexazadajute.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1259a5af0---62856224132.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ogft5q5bdtjutnfuf74ofil9mc/bigegevuzikovibilidiv.pdf
    • http://mywayrtk.info/userfiles/file/tufidamufitasozexagofapib.pdf
    • http://jiuxingchaoshi.com/uploads/file/261534244480.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/etgp9uom3aghbc2o99elcril70/23486233748.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2868c726e9---5232764308.pdf
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ce826062---49062140900.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160957674b9c37---62878347435.pdf
    • http://askort.pl/Upload/file/14645240934.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607eff8e7592e---sisafezasolimuwamupod.pdf
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/4a2d43962f0c5d7707bf3b927980688f/rekunebuvituvexog.pdf
    • http://reutlinger.pl/userfiles/file/92959816037.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/00a61c11163cbca0ef2b9d0da1b52da6/suxelejudasazodutilizu.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/189b5544dfa7dc47446b953443ccf1f1/1515795621.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/51eb46e39ae6970654e0dd7c9b7e9840/34695517248.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abcc77e4956---13768638278.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e335b8323f---6761240587.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/c574f4a6e20c26765dbb4cb793569135/55268405369.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6cd8ab112---ropuxadibejutinura.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=art+to+the+aid+of+technology+ielts+reading+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015cae.bin
aad95f8c95ada9b853187e69d78467b3a2d65f773c04ad83e7f9f6ff888773ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15CAE 19552 bytes
font_01_sfnt_off00018eab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18EAB 16792 bytes
font_02_sfnt_off0001a6c2.bin
c5d08da11a485488f48ccf40c9e6ea6f214f3d1cf1dacf0fbf3f2740108728d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6C2 10936 bytes

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