Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5eaf744d617e6a1…

MALICIOUS

PDF

100.8 KB Created: 2021-07-02 08:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6012fec87f2e49eceb3faf00e609ca1f SHA-1: 211bea18123700e1833b5c2beb19ac0b37b0dec5 SHA-256: f5eaf744d617e6a1eb0c6d688fd4bc79b13e553df8a6545c3a009d3cc449fd62
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded links indicate an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://dagmar-e.de/userfiles/file/26432268064.pdf
    • http://elazentrale.de/images/uploaded/file/dazirevu.pdf
    • https://pharma-tools.eu/galeria/file/xukebokabezuven.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b31f6512edb---11223618197.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/02b0ee737fa689db1caba7b3d968844e/16165645956.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608110e63bdb2---wujumabebozet.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/witobibatabogedogazo.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/87qj25acbripfaoqgtdi40k4ko/juvojetetigabugirobeti.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077bfbc45975---18992785879.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c23b0092534---segamixola.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/384himqk1sine6m46a8vublssl/getomud.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091129854f05---3113859664.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b2dfaaa74---jijotuma.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c283b86d8cbcc0a606fe2e4700f6c5e8/30744685679.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c141b49ad---29617053923.pdf
    • http://connect-senior.ch/uploades/userfiles/file/38618705646.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/c6e7ac0aed62bb1bf5b6f014d30806d3/59486173769.pdf
    • http://harryreichert.de/uploaded_pics/News/file/92726889565.pdf
    • http://baohanhranghm.com/upload/img/files/piniruganut.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091ad66a2438---segajixawaleno.pdf
    • https://kimtuong.vn/isc/public/files/fckupload/file/53215682008.pdf
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/43901074965.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a21830ebec1---25428258445.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/cf68827d73ef9b37fe30e2c40d747dc7/29729396336.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=time+of+conception
    • 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_off000128bd.bin
4a58e99fbacc657475a02233b428717fe2c7819778961b7efb10d7aa77dc0152		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128BD 10128 bytes
font_01_sfnt_off00013f53.bin
caba0a7c11a0e22b1aedcce9af2eab79169704ec011667a1401a0a01b30112c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F53 17648 bytes
font_02_sfnt_off00016de8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16DE8 16792 bytes

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