Malicious PDF — malware analysis report

Static analysis result for SHA-256 674a09b1ae6ff582…

MALICIOUS

PDF

78.0 KB Created: 2021-08-07 03:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a0c476384be9af892ce7b961bf19177 SHA-1: 1bedf28fac85d6b173e5e23d009893eeb664bb3c SHA-256: 674a09b1ae6ff5827bbe50ae16f87e2413f806dc3ce985acdf5dc2519b29dd9b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites and other domains, likely intended to redirect users to malicious content or phishing pages. The presence of multiple external URIs and a link farm structure strongly suggests a phishing or SEO poisoning attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drafthe.ru/uplcv?utm_term=achyutam+keshavam+krishna+damodaram+mp3+download+songs.pk+female+version
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/32654833904.pdf
    • http://seanmore.com/userData/board/file/matijofijajivavuwif.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/88fc3a2089862fd85fd9e42b9ad15930/lirojoluzasoriwo.pdf
    • http://gistys.com/userfiles/file/gojusorijef.pdf
    • https://tolgyesvolgy.hu/userfiles/file/peset.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/217c3f65bc10226cbf9668fea53664f2/71831279157.pdf
    • http://sun-eko.eu/files/file/vowodesubonewuj.pdf
    • http://hrt-foto.hu/_user/file/xezijonelexaluwogalilawi.pdf
    • http://laduses.nl/image/file/sefapewiritipun.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3bfcd9bed---nepemajuvomidi.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/lh1abh5942m5mtt0cbeabe4qjm/wezalutilazixope.pdf
    • http://santehnika34.ru/images/file/desofeguxiseputadiwi.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/37c5340dfac48a11b0b1487bbbe03158/mevaxewefef.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/5e632593ae82906d782a40f59ef90eb6/morufivesodidexe.pdf
    • http://cichanski.com/Upload/file/93285702642.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d7941674156---61732943074.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5fc17b6ec---sifewidivatax.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7fcb4ea69---vuderibipalod.pdf
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/86223324158.pdf
    • http://banghetretunhien.com/media/ftp/file/jatitajebabuvifewiburu.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca73cab2e---17804531682.pdf
    • http://championshipsportsrings.com/clients/23492/File/76790602102.pdf
    • https://www.crpm.ch/ck/ckfinder/userfiles/files/biwubadexapovupilapit.pdf
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/kevezejixur.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_off0000ca7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7D 16792 bytes
font_01_sfnt_off0000e294.bin
febf2f35b2eacf873043d03d5e9e38a9d6e7e7a69ec917eed287594bc82457a5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE294 11744 bytes
font_02_sfnt_off0000fe60.bin
39fa7cec6e070389fe72980ffe6ea4dc36a5f3f8ac204113ce59da0dfe277be2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE60 16268 bytes