Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1828ec036fee23…

MALICIOUS

PDF

70.2 KB Created: 2021-09-27 09:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dceb5bd5abe4172652ae56583b4b23bb SHA-1: 7f444bc5bdc8d845bb79949f78be391f413a6cc7 SHA-256: ca1828ec036fee23f4e3291f259d435e947c2694cffc881450a9fd63178c5684
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs indicates a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://nfrostov.ru/upload/files/kovipobuduba.pdf In PDF document text
    • http://iehyun.com/editorupload/file/nokujopibofo.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49805430379.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/kakijabepubozilenaduxotu.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/kixowusokiwibutuviliniro.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/99d85a1949b07b2e84b6d55f788a206c/40483127580.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c963ba7a1530e71536718a0ebf79d24d/zesez.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/tasenazagapuvimivufafipod.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9fad9a5305fbe1c023bef52c2d1f0933/68243943502.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210922_EA99F6B9854C5E43.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/702869868.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/87068737573.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/41049169059.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/lezineporemaji.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/47232598715.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/39385025770.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/terobakezo.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/75566734538.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/sisomamadadizudiworotatik.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/3ef9423f8b1b077adcfdb9852183b717/29795157799.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/71036575251.pdfIn PDF document text
    • http://tayles.com/uploaded/1875072446.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137486e152b1---kanejoxawiwenupuxufiborab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=pokemon+pearl+action+replay+cheatsPDF 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_off0000b230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB230 10848 bytes
SHA-256: 3685c47c541b5ff65aba17b75ee3f4ef8b6796152e345a3d14d1aadcc76a41b4
font_01_sfnt_off0000cb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32C 15596 bytes
SHA-256: 5a7556c16a3fa8e7e7323fb7f312543e1331565cca0b1b4195e85b202e12a2ca

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