Malicious PDF — malware analysis report

Static analysis result for SHA-256 872585ca3e53c869…

MALICIOUS

PDF

101.7 KB Created: 2021-07-12 23:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b67de51fb38c679d5670ad17522bfb5f SHA-1: 9517e11be2a48e10a211e90293f1f19d3df8aaac SHA-256: 872585ca3e53c869a70df7052a9f50691a05da6b3320b30156b30d61875c9d64
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 ML classifiers and ClamAV, indicating it likely contains malicious content. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to distribute further payloads or conduct phishing. The document body is unreadable, but the heuristic firings strongly suggest a malicious intent related to URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://spherule.org/wp-content/plugins/super-forms/uploads/php/files/45d3b57d74a2da3934180e8cd192a23c/sijodunonulebemiduvimij.pdf
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/emjn9dlgjherj9b3bfsf9cjibk/54518548138.pdf
    • http://barcabianca.eu/upload/file/lawojefurolovuguf.pdf
    • https://kartplast.com/resimler/files/19387545497.pdf
    • http://saluteebenesseresas.it/userfiles/files/sotekerisobizoxuzosonez.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089063a8b458---22039753644.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ki5tksvut9m840q30s7dqp4l4l/10829044017.pdf
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/maforetavewoz.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/808417429c62d0c4f25c7d6983199727/bikil.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/2cff04be2880e1568fd7abb344d4a921/jajemibem.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/nofpeoqf1vmsag1f6mnmjrc3us/pitonon.pdf
    • http://geodez.com/pliki/file/gujibogogoted.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092205cb5b76---13063603657.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16084d3f0858a9---ditevofujutik.pdf
    • https://xo-sound.ru/userfiles/file/lexibukelegimewiwo.pdf
    • http://modellszerviz.hu/userfiles/file/58188709391.pdf
    • http://askort.pl/Upload/file/51299565499.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/igadbdqqu01c4gf9dr2bj90n9n/86509882936.pdf
    • http://glamour-nsk.ru/ckfinder/userfiles/files/68882812769.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/l192oblrjnite03obali1o03vc/43654055407.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b65a31c3ac---19223507585.pdf
    • https://magerp.org/upload/files/zalevujalavetefadatu.pdf
    • http://apsencollege.org/test/fckeditor/file/71521049416.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160731eb9ec5d2---27517968181.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/tujrhaqe3aoi3vqlnj9dqvrmiu/29590751715.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=anterior+horn+cell+function
    • 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_off00012c72.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C72 16792 bytes
font_01_sfnt_off00014484.bin
73d43a6550dd885a46f841d0d60d35cf7b0f67d83c09f881a0b80974f64be088
pdf-font-stream PDF embedded font (sfnt) at offset 0x14484 17612 bytes
font_02_sfnt_off00017306.bin
7db2bf0405954187b5b32be22c3bb99d74fb28f9169924029df8ee2fe01d942b
pdf-font-stream PDF embedded font (sfnt) at offset 0x17306 10184 bytes