Malicious PDF — malware analysis report

Static analysis result for SHA-256 1933b0e2ceaac74a…

MALICIOUS

PDF

73.6 KB Created: 2021-09-12 07:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e7b447b3d7f8dfa02cc15fa3ef22161 SHA-1: deb387675fe5d3db3aad0ec470e13bfc87ddbca5 SHA-256: 1933b0e2ceaac74a64862c856732a0aaab55dd5781f363ad2c1de2e67ddc21cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=assassin%27s+creed+android+wallpaper
    • https://aslimitada.com/userfiles/file/paxezavukozug.pdf
    • https://dbmotorbrokers.com/userfiles/file/rirugilisanux.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/nm3hf6e5p9vmiqmafdqd87b356/41564381301.pdf
    • https://dogathermalhotel.com/resimler/files/ponomusofuxopamanupitese.pdf
    • http://naszemotyle.natura2000.pl/imgturysta/files/wonuvepuligakux.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/dc35bf164fa7c9c207ddd9e2a88e215a/252511858.pdf
    • http://boekenwinkelindex.nl/images/uploads/28050489829.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139edd4e4dff---61700150965.pdf
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/68850801169.pdf
    • https://songhong-thudo.com/img/files/53015895337.pdf
    • https://chungangroup.com/uploads/files/202109041255362186.pdf
    • http://ajisushionline.com/uploads/files/15840487442.pdf
    • http://mskabel.cz/UserFiles/File/kipiderobetanelininuguv.pdf
    • http://mail-business.ru/uploads/file/zupamujapotajominokowuti.pdf
    • http://bearings-home.com/userfiles/file/61640962623.pdf
    • https://thefertilizergranulators.com/d/files/1647441942.pdf
    • http://majortaylorride.info/images/uploaded/file/moloku.pdf
    • http://babyshelter.net/assets/upload/files/12053928500.pdf
    • https://ilonew.tasksplan.com/userfiles/files/bedagonunorobewokixuwu.pdf
    • http://bmfjhjk.friend-match.com/upload/files/10130066656.pdf
    • http://koutingchina.com/upload/files/59684631663.pdf
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/13098740105.pdf
    • http://www.halpellet.hu/userfiles/files/90365897682.pdf
    • http://www.bufolari.com/public/immagini/file/gedezuku.pdf
    • https://esperidiaogomes.com/userfiles/files/fekefofaxiserem.pdf
    • http://evaemlak.com/userfiles/file///solaroseriwutil.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_off0000bc45.bin
b40fdb30797fb0de22f17cc56a87b5eff44fdfb1a20b0cf1a68ccf8d354c32b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC45 10512 bytes
font_01_sfnt_off0000d460.bin
cfb75d27a97b5ba63a6ec6a39bc9b29d06cf246601e8faefdd24938576aef713
pdf-font-stream PDF embedded font (sfnt) at offset 0xD460 17132 bytes
font_02_sfnt_off000100b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100B6 16792 bytes