Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3ecedd28803eec…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 10:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7854c975cde6b0470ab0a562ac80234a SHA-1: f501a99d3c48a9ae3729cc747ffa0f94d9f764e0 SHA-256: cb3ecedd28803eec5609a994ddb2d78d394d475352e01692ac51e56cc958961f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm strategy. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and does not provide direct textual clues, but the heuristic firings confirm the malicious nature and the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://itchanoi.vn/uploads/news_file/48468447168.pdf In PDF document text
    • http://historia-bfured.hu/userfiles/file/50532128158.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/4b4b040e25187f8928d8e407d1f55ac4/69577399326.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/073r7rulguifdb2jiddhg2o8r9/xitefewigesevuvamiweka.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/luzuzidorarefekiponaxopob.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/gabawogofogonujuzip.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/mq6sldusebpb27kuqqn2ouo6i6/90301645290.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/73384950861.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a652fbdf02e---30460914289.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/4028902811.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a83d5bad529---86988223317.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/74sfhhpb8bssh8q6a4tvpdhjeb/mawugoterod.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/isf6frhi29fbao03t68brvker8/bogelebuvizido.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/pazim.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/d5cc8913f3f249848e9e53fbc5d838fb/39472486526.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210708105436_3rkhm5.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/94122529568.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/85539348945.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/36476867477.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/xalukifofepofezugu.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7a4f50777---36033343116.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/47410075597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=african+yellow+cichlidPDF 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_off0000dcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC6 10488 bytes
SHA-256: 01994e52a5f4c026d2a81a0c32f9f337d9a32d4e9d289794f71f89b7d9a768a4
font_01_sfnt_off0000f494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF494 18036 bytes
SHA-256: 30197770398f38c1b956bb32578479f88f7ceddbd4077803a652888d6b718832
font_02_sfnt_off00012353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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