Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51f379774fd2fe1…

MALICIOUS

PDF

86.5 KB Created: 2021-07-20 08:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e249f82343e8d15255bf64ed8e984c4f SHA-1: 044257b1b7ae8b098cd0cb8ecdb6a7037ba23809 SHA-256: f51f379774fd2fe143a301fadfa5c595b2c35b20fd8fb6910b64a6e91bea3037
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/34410734013.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ial7sa3igip386u2tc0i8e3nd6/5751624738.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/287230d7348eb67e15a60c68bec962bb/43678813639.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/9d93d832eda48448e49f99c39cc85586/32379792225.pdf
    • http://career-id.org/ckfinder/userfiles/files/ruvojudu.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/70c92cdd0eed5f9b83ead6d932631e3a/somiwulaxexilawutenibir.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607553ad4f0e8---43275788700.pdf
    • http://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/97287884759.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/a736ebba3c9d2d04ea577a609f1c6c53/80958280426.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/rg97a4r872jni85r8o9e98scv7/47328756986.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6abfccb2b5---29719003194.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a50ff98a3f---13694573234.pdf
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/5066539082.pdf
    • http://euroteam.vn/ckfinder/userfiles//files/6262617069.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/17e7f3a53664e6e0c24c6f36bf3441f3/domevowomelap.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f2ef24fc9---gopovaberavuridajigit.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d1a3b30e581a933304b035f2ece54e57/jixiviwufonetibuv.pdf
    • https://walkandsmile.com/userfiles/file/73393975674.pdf
    • http://global-insurance-broker.de/downloads/547097355.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/v1om5q8hsdr7icigs0i5nds155/26458742167.pdf
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/kirexodapomisam.pdf
    • http://www.europesolidaire.eu/userfiles/files/29303088338.pdf
    • http://ghemassagenhatban.vn/Images_upload/files/86266941211.pdf
    • http://hawks79.com/clients/85064/File/gedofozoxokulat.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cecaba94c65---57992510760.pdf
    • http://clinicaveterinariaalbese.eu/userfiles/files/barafesomabeboragixodowi.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/903bc9aaee04381270d5db3d30aca8b1/88369691786.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=soap2day+tom+and+jerry
    • 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_off0000ea68.bin
4173219a58490b22e202295ac2783f427ec4c838e658773a22b0ce68bd0bc294
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 10684 bytes
font_01_sfnt_off000102f9.bin
7c2e3092915a230be47375042fbda74c73f3c80674386a89a93bd5d3df1f98ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x102F9 20608 bytes
font_02_sfnt_off000134cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134CB 16792 bytes