Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dac72d204d0c469…

MALICIOUS

PDF

72.0 KB Created: 2021-09-17 10:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2b334f11ef02fc3392a2bb479c1fa208 SHA-1: b531049cf13677b431dc6c12fdb2d85adc6ddc15 SHA-256: 0dac72d204d0c46958ba91f2e5a0d5f464828bcaf25fb41e437e616b23024b5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress upload storage locations and disposable hosting sites, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather for programmatic exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://karapinarinsaat.net/userfiles/upload/file/16634368573.pdf In PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613250be5ea35---lolip.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1c30169415d209bac3fa5f95d41a398f/31416440707.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/31458706094.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/94118805053.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/64690676120.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/40457192000.pdfIn PDF document text
    • https://eurotig.ro/file/23461348049.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/kuxoguwapitalutap.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/94043624832.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140e5dce876e---pibabofotipulapugalige.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/77837750944.pdfIn PDF document text
    • https://hojoairport.com/images/file/57863889388.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/jurijoreru.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/5gme602fciclui6qnsfqkqiveo/nagosuj.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/vafeloponarixe.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/ff5730da2bd398c1f2f2b6a6f109a8bd/77554227223.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/30013742778.pdfIn PDF document text
    • https://polaria.cz/images/file/zagilesudugulolo.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/jofag.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/89556601529.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/69114952726.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/79545667288.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130146c44f0f---75453259263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pokemon+ultra+sun+and+moon+pc+downloadPDF 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_off0000b804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB804 15888 bytes
SHA-256: 25e6defa73a00db8307bcf258b27c8fbe4439c528e0e8539375a31ca7f2dd8cb
font_01_sfnt_off0000e084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE084 10864 bytes
SHA-256: 0801833f3a97da2a5cfa7b381014a83f184eddfb6cf6e397041dd81b5497d5f4
font_02_sfnt_off0000f9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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