Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe7df76e60a0e3c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-02 14:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 603e7e4b62cce64b504c9e09f388fd42 SHA-1: 57a6e9537688256cfe5c2448b9e023aec20a867e SHA-256: 4fe7df76e60a0e3c337d0dcf2d6a529dde583272102a9ad426c2bb640757850e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits PDF vulnerabilities. The heuristics reveal it functions as a link farm, directing users to numerous compromised WordPress sites and other disposable hosting domains. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/tpo1idi3mubn3vinm0utddpqmm/84741468456.pdf In PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/58198cc0e7918d5362e32b92edb0d79e/kevojuluwununaxurezaso.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/27641931185.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/sijokoze.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6e2436879f---sujedina.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/44a98e3081923c4185eb423f223833b6/6996273245.pdfIn PDF document text
    • http://yongqingtech.com/d/files/lorowutidogolufup.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/pasewup.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/44794010076.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/sinabuzo.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/gujuxosojediner.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/soviv.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/24531279741.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/e2e616f7ed96757442a44f6ea5bbfe84/92962209814.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/27552979049.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabfea667aa---78406324656.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/24619900732.pdfIn PDF document text
    • https://yz-yongzhong.com/upfiles/editor/files/keburup.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/35582278146.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/cb2160b3ed7131b4ef410d1ed98017c6/30456825689.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/88028308109.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dff8b3c440---wuvomunanozexu.pdfIn PDF document text
    • https://scalping.ir/data/files/file/xaxoreruvadeni.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc34f6edd7---69478918555.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ec3c6596fe---luguvaxadurajovo.pdfIn PDF document text
    • https://atavio.ru/files/file/83798261649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=erhardt+leimer+cv2201+manualPDF 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_off0000d470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD470 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC87 10788 bytes
SHA-256: adf1e006d66bc4feea360060bcc558942e26ad41bda6a070de836c5527c8f884
font_02_sfnt_off00010537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10537 18236 bytes
SHA-256: 82ec9528898785ca1f178351105a973c62ee3e28f7bd498cabf3dacc8a16ef3c

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