Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d80a28eff49437…

MALICIOUS

PDF

76.9 KB Created: 2021-09-25 07:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d63e425007b40a2189705b36ecc2ca7a SHA-1: 0c7ccfe8f504475e5265b6b4ae2cdd871accb41d SHA-256: d1d80a28eff494372a7f8491405d1c53d43dad290de3339fa32f59b58e7d9869
156 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://kerama.altrodesign.eu/ckfinder/userfiles/files/senubineme.pdf In PDF document text
    • http://maremania.net/img_pagine/file/98999795442.pdfIn PDF document text
    • http://bankerz.in/qpic/files/18441484872.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210924_537BB848CE74EE4B.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/68880501128.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/30018641116.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/51384983413.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/gupelovuwifisebav.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/51737311753.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16141c4c157e77---49051617389.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/69010983651.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/16570683170.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409b2f71195---vasute.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/kr2ehu6m27ump15n1spsvtful6/mixej.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/begesupizekabamutitoboku.pdfIn PDF document text
    • https://www.patisserie-flechais.fr/ckfinder/userfiles/files/vugerim.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/73229687560.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/38922838282.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/m0na720etp6igfkb7dkjbu5s4t/lelotamiputejuximuwupot.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109102249331369.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/24958835818.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/51808521870.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/revatekopolefo.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/xarorikinonod.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161412c0216e0a---wulokazukijirakusob.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/dutefodozuzesat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+use+chromecast+mi+tv+stickPDF 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_off0000c40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC24 10680 bytes
SHA-256: 4a06f0274fa3a9f5a23e9b512c069fc9fb8ebfaf2211f122e76fa68f33d81bff
font_02_sfnt_off0000f4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B8 18760 bytes
SHA-256: 8227cd017ac2fc82cf77170b6190d7d0f2c0f429c0d7bd2815f592126ca26ef2

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