Malicious PDF — malware analysis report

Static analysis result for SHA-256 74e1c01abe397b67…

MALICIOUS

PDF

90.6 KB Created: 2021-09-17 13:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52a80fbcfb34c152112c55e1d0fe7bb6 SHA-1: 6eaf2b732350fc81dd939a5c50fcc34071ef1ec1 SHA-256: 74e1c01abe397b67dda9518957bee81a7babfc18eddd9d055ab68de77747e28f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple websites, some of which are hosted on compromised WordPress installations or disposable domains, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crysiq.ru/uplcv?utm_term=pixel+rom+for+redmi+note+5+pro
    • https://asmitahrgroup.com/ckfinder/userfiles/files/50706084137.pdf
    • http://chongthamphucthang.com/images/news/files/12220792853.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/a7848d8ce72ad92c4b4851b1c3578ffb/89928455292.pdf
    • https://navoloki.mebel18.com/uploads/files/59657106111.pdf
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/29648285827.pdf
    • http://aygroupmuh.com/image/files/zukif.pdf
    • https://nls.vn/upload/files/xejafajapilezibowudujar.pdf
    • http://jdjcnc.com/upfolder/e/files/20210909201104.pdf
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/79227929748.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613fab4d52e9e---47979601959.pdf
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/gujusax.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/5e86f220ee3ee0104fa48e7ee76cdda7/34017657240.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/o0h6o8hgh3oj1atijolac1anim/bepinola.pdf
    • http://tscyw.net/userfiles/file/20210909231031_jpvnwu.pdf
    • http://piri-piri.pl/ckfinder/userfiles/files/88612691168.pdf
    • http://kaztelcom.kz/ckfinder/userfiles/files/tizuzatexevolexeso.pdf
    • https://kiaavcilar.com/upload/ckfinder/files/xenetabuxowakem.pdf
    • http://jamesandsons.ca/userfiles/file/69942574860.pdf
    • http://wonderful-foods.net/userfiles/file/15120750588.pdf
    • http://bsa-billiard.by/images_from_html_editor/file/43833900998.pdf
    • http://haenuri.net/ckupload/files/kejutebijawedapivufatesa.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_off0000f637.bin
cb5f0cb12620cbc58657a76ca10c81f7ecabf68b3829401eb1d1248e0867cb69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 20464 bytes
font_01_sfnt_off00012cd2.bin
2089a802a7b404df693b33b6afcddef4f137b332dd76d8f86889815e5e066e34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD2 10568 bytes
font_02_sfnt_off000144eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144EB 16792 bytes

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