Malicious PDF — malware analysis report

Static analysis result for SHA-256 71454ca0d3c7d8eb…

MALICIOUS

PDF

81.0 KB Created: 2021-09-21 06:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c8a6b1c0ab3187759552da3c937a5b0 SHA-1: 083488ef76ab7f4408a47914a70b6cd97af9d188 SHA-256: 71454ca0d3c7d8ebc3f0985c473ac9e474934ba0b3f02801d1f5a77bcf72b031
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to potentially compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/27158564408.pdf
    • http://bjqyms.com/filespath/files/20210910011051.pdf
    • https://pachetedeturism.ro/images/files/zetabatodevudevexirala.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161391f45a7ac8---20834120233.pdf
    • https://esterkins.de/ckfinder/userfiles/files/94904538836.pdf
    • http://makeyourpartnermelt.com/userfiles/file/xenobuduwatenazo.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0013c4ff2---62750048955.pdf
    • http://chongros.com/userData/board/file/gopowe.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/fifeveg.pdf
    • http://hzeiger.com/userfiles/file/mutax.pdf
    • http://atsolution.org/userfiles/file/20210902134346135321044.pdf
    • http://coimbrasoftware.hu/images/uploads/files/88564616039.pdf
    • http://zabradli-znerezu.cz/userfiles/file/somanodujogivedilovasax.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614180be0b83c---danijem.pdf
    • http://paradisetnl.com/FileData/ckfinder/files/20210905_394572FBC3731FC9.pdf
    • https://aiaciran.org/cache/fck_files/file/fazifixu.pdf
    • http://rioairporttransfer.com/ckfinder/userfiles/files/wexeremanad.pdf
    • http://status.cz/UserFiles/File/92418127430.pdf
    • http://baominhlabors.com/upload/files/bejodejatutex.pdf
    • http://debnine.net/UserFiles/File/xixigowopasop.pdf
    • https://careerroots.net/ckfinder/userfiles/files/gibelotodamifesipefemarat.pdf
    • http://9262895.ru/ckfinder/userfiles/files/bijafubojaxekipoke.pdf
    • http://bolshunoff.ru/images/wysiwyg/file/jemoz.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/ec40d9098e56c98c228cbdb96172587f/28979153817.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=tapo+camera+app+android
    • 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_off0000d421.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD421 16792 bytes
font_01_sfnt_off0000ec38.bin
70c880d47d96f70242a990f5fdfe0b348d5d21d55e28c3b44a2a074ff68cf806
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 10324 bytes
font_02_sfnt_off0001036c.bin
1d08989c27f8d5f3a954a2a88a05423a2d5a3e51f32fcf1b2286efc74e085808
pdf-font-stream PDF embedded font (sfnt) at offset 0x1036C 19956 bytes