Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f12c524f17bd385…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 13:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21764abfd05afb07cb6868290bdbd20a SHA-1: c79f7f78dff61374f83b4f471d958e7db3e84588 SHA-256: 2f12c524f17bd38590d28350b7f3d51b66c1148c0a6300b97de272f65094ccd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress upload directories. These links likely serve as lures to download further malicious content or redirect to phishing pages. No scripts were extracted, but the structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613587beb7788---ruvalelozituj.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/gh9hj5emtc7027bsl41k5quk5a/xerivimuvosixiziwu.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161461ae2a4ef4---libopitotajun.pdf
    • http://cityfate.com/files/files/xasagoxiparuxi.pdf
    • https://vinaconexmec.vn/uploads/news_file/rakevipatofokebadijolukep.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff47d98eef---wupifarakepatefal.pdf
    • https://ewdel.cz/ckfinder/userfiles/files/61596307632.pdf
    • http://nutronicltd.com/userfiles/file/50362841510.pdf
    • http://sportschoolindex.nl/images/uploads/4004479131.pdf
    • http://swiss-ex.com/images/blog/file/saratigel.pdf
    • https://happycolaborativo.com/uploads/files/52370700548.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/cb42d15596c3cee703437820e874a9e7/nowonedibo.pdf
    • http://criminisiepartners.it/userfiles/files/sivafesulolozabizewu.pdf
    • http://gocep.org/data/userfiles/files/nukikavuwivubamolikaw.pdf
    • http://hockjoohin.com/admin/uploads/file/nasuzemeletifodubegega.pdf
    • https://rdsdealers.com/ckfinder/userfiles/files/43109604262.pdf
    • http://apismorava.eu/docs/54520008981.pdf
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/nedovupenab.pdf
    • http://bouwbedrijfbouwheer.nl/userfiles/file/zasukilubaborukifebadivid.pdf
    • http://hoangduy.vn/vn/files/nenumopakepexidepabef.pdf
    • https://x-leather.com/radsportfiles/file/45532354900.pdf
    • http://madurastones.com/userfiles/file/89534292335.pdf
    • http://szyqjsj.com/UploadFile/file/20210916051724818.pdf
    • http://ibookingkr.com/FileData/ckfinder/files/20210906_41ACDCD80210550E.pdf
    • https://ooobelkom.ru/ckfinder/userfiles/files/73867559835.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=raja+rani+old+movie
    • 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_off0000dc12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC12 16792 bytes
font_01_sfnt_off0000f429.bin
785f69428b7eddcaf4af8479645a04b23b5eef1c81ae3e1fe7a9ecb406fe0bb2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF429 10384 bytes
font_02_sfnt_off00010b88.bin
48fc5afe58c64e48d49003f6afe63e40a48611f76c78fd3e99fba1ac0f90910d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B88 18252 bytes