Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e70780cd64d3c2…

MALICIOUS

PDF

73.5 KB Created: 2021-07-01 10:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09b87d3a56f094019790ab563c5994f4 SHA-1: ea9d01939e7c49ccd66abd2f46aa2642a585a8e9 SHA-256: 20e70780cd64d3c225ce8ea7fac0e7db5d9ae976f387d266b3a29d0b3569b474
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nomylo.ru/uplcv?utm_term=crystallography+made+crystal+clear+pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076f11f16104---33182646416.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/7mshlrqjf69knvc6bo6ium6ntr/64089236184.pdf
    • http://alt-1c.ru/userfiles/file/xelipejiruwigawowisodidek.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/74543587674.pdf
    • https://atkarisuli.hu/userfiles/file/77126234692.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c224a0dcd97---xemegudi.pdf
    • https://theatresaucinema.fr/uploads/file/16678231143.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098611aecfdc---96197909317.pdf
    • https://samarpanbharat.org/trila/userfiles/file/kepiroxa.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a17275bdf3f---3755918119.pdf
    • http://bellina.pl/userfiles/file/64943563477.pdf
    • http://zaun-produzent.de/userfiles/file/40827700269.pdf
    • http://bet-balance.com/userfiles/file/4079143606.pdf
    • http://brilspa.ro/userfiles/file///98907157971.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4272c214c2---90829905841.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/f2614217f6913cdf1ee31d1d6e001a90/99224091560.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/7vv6qr0ir7sseaq28k828jmnim/rimosovoxaxanetamep.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f687ec1590---50868345441.pdf
    • http://csc-028.com/userfiles/file/20210607164924_pz84im.pdf
    • http://cycling-software.com/files/file/kemivodolujevamojerozi.pdf
    • https://mimpishiosatu.com/contents//files/17790589265.pdf
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/gulafezo.pdf
    • http://waterlootour.com/FileData/ckfinder/files/20210626_B28663E15702537C.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160943d68d72c5---totagifigu.pdf
    • http://onishi-kyosendo.jp/archive/20897649423.pdf
    • 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_off0000be99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE99 16792 bytes
font_01_sfnt_off0000d6ab.bin
7a6e2d648c51a926063b5a865bb166357a421fa4e784251b15cb80ed54b82a68
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AB 15920 bytes
font_02_sfnt_off0000ffce.bin
3d4f92077c073f47d6df32a9dcd368a468a09dd1580fd0525e7869e1ccddcec8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCE 11016 bytes