Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb47072ab00b634…

MALICIOUS

PDF

77.9 KB Created: 2021-09-09 04:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d3ac814e5768cf2354b03978faed805f SHA-1: 504501bc64522adb1a953747a21e851df48a10c2 SHA-256: ceb47072ab00b634944018dbc03baf0cd04fc315a0dead4599f77b8277e530f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and URLs pointing to potentially compromised CMS upload storage. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The document body is unreadable, but the presence of numerous external links strongly suggests an attempt to redirect the user to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://gekon.net/userfiles/file/mozugejibalasipi.pdf In PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/02bc1bdc8cff9478a7ffcde3650bbd8b/fekesiteg.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/budidemerazozezizabedu.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/dorijudikomewenogoninu.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/73549648287.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-9/20210909054740258208.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/joxusewemulanilir.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/nenilakuxewoleme.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/35314564693.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/wesomibutusubowurumitino.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613901dd43192---jokiv.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/c97c3914488329167bd7beccef8254cd/jizasixujig.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/mapomujixuferebubogi.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/qfq3smefpca3v8obqrq3s835k2/42662569912.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/tojarijejilinabopu.pdfIn PDF document text
    • http://saaretravel.ee/images/file/wigijexudelefegub.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/37358419624.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/zopemo.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/biludevugiwizi.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/nofiregefarexobup.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/4b7f0a9668d9deeaaeff629808feb8fe/xunowozedimilej.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109040506415818.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/thgfneqg31huji3o8c21tccrf6/rumapapaxemafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=put+locker+freePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAB 9996 bytes
SHA-256: eeada409375c0e3105db9750e7ceda6f72fd89eed00a6cc73e3da369028f0ed4
font_01_sfnt_off0000e206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE206 18508 bytes
SHA-256: 3d43f737a8caff4a05c243614846284429a52ff48251f1549630fb4b0d4df91c
font_02_sfnt_off000111c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1