Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1e66643513314e6…

MALICIOUS

PDF

95.7 KB Created: 2021-08-15 05:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 50850a3817d7a7ffe7e42f4822f43db4 SHA-1: f851f3a7917ddeb0a7d535f1a037e026155a0ad5 SHA-256: e1e66643513314e661297bb89b4711c609e7df8b2d5c53fd84e60387f47cf7ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to potentially compromised WordPress upload directories and disposable hosting sites. While no scripts were explicitly extracted, the nature of the PDF and the presence of numerous external links suggest an attempt to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://vandervalk.reviews/app/webroot/files/userfiles/files/67550456297.pdf In PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abd06b20eca---99987317896.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/80165312866.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/893d194e316a602b9daa9d3f15465cc8/49139773660.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/tofisofulose.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/32267143418.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/warezofarogolike.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ad6b89cc3d7a4f835657969333f67d91/pepajuborobabotebasiziwa.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/7461761a3b1094650ae42c348ed669b6/luwizesofa.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607384b8c5b10---96557742580.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/6a855cd5566f94bbcd63002581996865/59709747751.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/u67065u7emv6urjim471tsesd5/repefokokasewo.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/1kjj23k8o634akoks3f4fg6e6h/69783116686.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dedd81e40b---23648408198.pdfIn PDF document text
    • http://stroi-sistema.ru/img/nusitedotewalofedozo.pdfIn PDF document text
    • http://aawyx.com/sites/default/imageuser/file/zigufubisiniwomaro.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/xufiwoxadetel.pdfIn PDF document text
    • http://esistore.de/userfiles/file/12116236103.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/0628cb8a7beb44ffa3d7c08282f741b2/fegoduseborepemepipor.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16274545569876.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/tajunonilaj.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/zibusorojuxilulekaj.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/danuvalajapumeni.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/zisutasexib.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609477e063b99---vajemimefakadob.pdfIn PDF document text
    • https://clubon.top/uploads/files/milerepipugipamulemiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=what+caused+the+four+freedoms+speechPDF 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_off00011292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11292 17116 bytes
SHA-256: cec3673d097013ea6340ac8b2e64b981be27b90846f1a9b81bebb8c3c03146b9
font_01_sfnt_off00013efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EFC 10736 bytes
SHA-256: d050c039cc0f54b3f088df44819a1fa408f77f68bc76785859789952644edf1b
font_02_sfnt_off000157c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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