Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac020ebd75c6d2a…

MALICIOUS

PDF

69.1 KB Created: 2021-09-09 19:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a3da2956806704463d5df157364e2a2b SHA-1: 36d34dcda9502ee6c45f19d3aea76ecc698e3310 SHA-256: 7ac020ebd75c6d2ae14ffda8d37a23c7a28b7c3b6566df7ad42e328775b60787
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics confirm the nature of the link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ugrctrani.it/userfiles/files/xivokur.pdf In PDF document text
    • http://nhabe.com.vn/ckfinder/userfiles/files/94308522907.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/89478046830.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/vogutap.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/77151827299.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/82856316167.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/759930fa5d26d746befd44d0ec62fbde/71369159856.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/vurepazat.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/mudilugolo.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613797c36e4fe---bifolubezetunudamo.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/73104073286.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/12625629542.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/57811100490.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/98194077474.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/10939034949.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/51380af50afb1c1353ccd862c1612213/duwof.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/59876025010.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/tegamesaxe.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/46392851896.pdfIn PDF document text
    • http://esangsok.com/upfile/files/vepodifitagituwejunuki.pdfIn PDF document text
    • http://maulich.vn/attachment/files/67379034868.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/rujadunuguzaba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=best+gif+maker+for+androidPDF link annotation
    • https://easyown.ddproperty.com/datas/files/72547968412.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_off0000b0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FF 10796 bytes
SHA-256: 8180a14162598d6a422df3bfc078c1f600b3c2d11acb989a51b0f4d91d893604
font_01_sfnt_off0000c9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C9 15080 bytes
SHA-256: 08b30c4bfeafc4a3cdeae882af23a020be6f1795726750c9f1544ff9b615a162