Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd49ac2026ff8852…

MALICIOUS

PDF

81.7 KB Created: 2021-09-13 07:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c15e7efdb03e0f4b0f437e6e1364b7d7 SHA-1: 1ccc84448041365166d662f5f927ef41c7e52535 SHA-256: cd49ac2026ff88525926dde56b1c76ed3f7e6c065d083c1f6a577c45386f0974
176 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, directing users to multiple suspicious domains, some of which are hosted on compromised CMS platforms. The presence of numerous external URIs and the 'SEO_DISPOSABLE_LINK_FARM' heuristic indicate an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://7m-shop.com/userfiles/file/40426378469.pdf In PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d02132c18---vidilugipajagamanizatip.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/28778640669.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/66746270912.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/zidigemuwovaba.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdcd779b0f---19611989867.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/76592054163.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/viwakevexutegosasufi.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/23666984983.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e4610d0fc---89634723756.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/3139952186.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/51154627083.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/22204719729.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/rakavedeleziv.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/7634784294.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/basitozedavezupi.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/fosamevaderunasajisu.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/livozilikotalerutanimip.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/82808900541.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/gofuduzetasikata.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/10257817847.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/41689268509.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/lumotupojolejogomusiforul.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/77251113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=dramanice+most+popular+dramaPDF 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_off0000db85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 10776 bytes
SHA-256: f5cf78e194dff895003c284a8b5573ae02052b169bdf7ee8a05acb6113e47f93
font_02_sfnt_off00010c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C61 17344 bytes
SHA-256: 5f1fa8d53ee0ae128ffc5f56a0d5963a43023e2950fda015881d14ee078ce2da

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