Malicious PDF — malware analysis report

Static analysis result for SHA-256 7191f6418bb174c1…

MALICIOUS

PDF

75.2 KB Created: 2021-07-15 14:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7c6ed9fbf2917f39d7acf439c0dfada3 SHA-1: 59532248b1e1a2022c9cd4e03e5012602eb03584 SHA-256: 7191f6418bb174c1fff938dbf4e54cc270ec146548dbec9fe796d6707d1752e0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised CMS upload storage. The primary purpose appears to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://aedwea.com/upload/foto/46748285203.pdf In PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210612085450.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/wewemal.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/7d1b56674088ff9d766c71a18f11dc1b/986455204.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/jibofowigowaji.pdfIn PDF document text
    • https://chptravel.ir/data/file/kifubopug.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/6b748837afcec5ee3224ea92296cf395/93186499164.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/btnthnjd16gjdmm32agslk8t2a/bufasuzufabafodasekatilek.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/watefokilogevizak.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder//userfiles/files/fumavekem.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/fab473007d9ee19d262cc2a620cd57f1/lofaj.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/wavekovuvumonosuw.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/42201129656.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/49795833547.pdfIn PDF document text
    • http://emannsltd.com/userfiles/wowejugilabevefevatopanu.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97f28d2169---10552701796.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/zumazesaboduke.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaa5ba3f37---bafewupasukigabu.pdfIn PDF document text
    • https://ekransamara.ru/files/83880441628.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bd39973ad27---sesutubaxabiz.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607035844bb4b---litetaripa.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/98771305674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=swallowing+and+peristalsisPDF 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_off0000c4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C9 16272 bytes
SHA-256: 0954222d12deda4f8d8f371e75c9d992dc4b291d4b8eb46ddd348906fd37f39b
font_01_sfnt_off0000eefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10713 10728 bytes
SHA-256: 918f3287c25b7e1fa5a2c60c09b3e76d2a54f3a1aeee7287a4900bd2922c1f5a

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