Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7d82b32574f9e3…

MALICIOUS

PDF

80.1 KB Created: 2021-10-14 00:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cc27b0193af472cc4f4a2bafcf5fb479 SHA-1: 6d1e35bbca6a7cf26ffd74a30f22bb98f9a07c1f SHA-256: 9a7d82b32574f9e39fb5831651446f46a7ff3587e589f89a98faaf586253b657
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous compromised websites, many of which are WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics suggests the primary purpose is to redirect users to malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=class+conscious+meaning PDF link annotation
    • http://unseenadventure.com/userfiles/file/girutokonuxet.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/dbfcf6b5990ebc82f638374dc7b0bcfd/106246719.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417bc0e0f4d---74502151870.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/d050126bf9228abd9d8cc932f7291224/bevaxowakozosikawiwo.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/temajeneju.pdfIn PDF document text
    • http://hidramaco.com/files/files/66609829546.pdfIn PDF document text
    • http://techmechengineers.com/uploads/lovidepojidifozalesi.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/21b3797f945a43da063451f6f5d1b04e/wukegowagoxixa.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/57494090231.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/95566589068.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/fepinutokodunoj.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/59777092122.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/seruxanilonotoxilozakabij.pdfIn PDF document text
    • https://ww150008.linebot.net/upfile/files/20211003081903.pdfIn PDF document text
    • https://esz.jp/img/editor/files/72931809696.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/99081224868.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/kekiwu.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/minobejusovaborigirekomew.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb641ed28d---subaweritegadixe.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/9369192179.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/lexiwamapanexewibada.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/1717394542.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/32021862780.pdfIn PDF document text
    • 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_off0000d0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE901 18952 bytes
SHA-256: 6a8941546a076490686c8647702e63c31438e50a0fb8df046b3566adede50d98
font_02_sfnt_off00011af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF5 10508 bytes
SHA-256: 94645d174b80a3fda80682e089fcf3eaeec5b47d7bfe54e0024199f722b26c09

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