Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cba08a4722d5ff2…

MALICIOUS

PDF

85.6 KB Created: 2021-07-04 20:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b2c1093de60f4be3c52f6407c38ad379 SHA-1: fdf8c2d14aa61ed8068ebb4e1e2411c53c949172 SHA-256: 6cba08a4722d5ff24409f6f7ba4f56297e95fba6f5c6685bfa47d77741e55450
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised CMS sites. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to distribute malicious content or conduct phishing operations through a chain of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/12d29e347164b67c25e983af4a718174/42461809144.pdf In PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/5191105442.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/d37b8ce7e684b5ecc56a8d092f90263b/nerokadozufaweleweso.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc41c68a47---22071807860.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/19883320350.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/6gqgt8e50qocbv42vn90lm9f02/danavudivawekaxewamoxomu.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/tifevazuwijelajewaxotaxu.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/64c0131393233af54ad8551127ee2f71/95989897593.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/rakim.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/kofisomik.pdfIn PDF document text
    • http://ruresept.ru/files/file/29362085661.pdfIn PDF document text
    • http://www.heksan.com.pl/file/xedozanatejamamubusujobe.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/2c1e199f1be3fb3932e26833d166cf14/71517782528.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/a374f17c36239d117cab53b37cdbe0b7/55361258649.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210527221256.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/42903140794.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/79771831283.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/9bd23b2cada38b4e2fc0b2da1cb5c2ff/43993098140.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160740f8e4ed93---zetuwobobikug.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/2f49e832ef48ef3d60ef3f2113f35bfe/wewozebununu.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/v83181ka6k6keage50pq806699/50737842399.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/41490057689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=a+interesting+factPDF 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_off0000edce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCE 16948 bytes
SHA-256: b85c931de376f4b5a916e534db8cc9329beec4f30bfa42b955744f3cbe2d0271
font_01_sfnt_off000119ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E1 10324 bytes
SHA-256: c8a9c716857ad12ecde0d9df6e520884da86add8d2c90eff8b517eb565564e09

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