Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed9179f0a175642…

MALICIOUS

PDF

86.4 KB Created: 2021-09-07 04:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7355a80a2457e823a6c02237c505a280 SHA-1: 1b6a91b17dee4614b812850ba50987ff215f5778 SHA-256: aed9179f0a1756420303726b5082d8592978ce050cf5fb4ce320a4cedf45165a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a likely phishing or malicious redirection campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the extensive link farm points to an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://smidgel.ru/uplcv?utm_term=csd+hp+price+list+2019+pdf PDF link annotation
    • https://vhcvietnam.vn/ckeditor/images/files/74796069147.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609796b47712a---87370171153.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072e8d2b571f---sezuxeriwe.pdfIn PDF document text
    • https://steammining.com/userfiles/file/jejumopakasenojatawasezoj.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/86734479707.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/18674147499.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a0614027f---basovefurufurutatex.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/43430598921.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612497f9bcc61---jewet.pdfIn PDF document text
    • http://servmed.net/userfiles/file/76663767843.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/puzogesuxo.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/goworomaj.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/bowuruwun.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/koxupowepuberimuvawufulom.pdfIn PDF document text
    • https://synersys.fr/contenu/file/27421809987.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/lufakavesa.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/34be7eb1b9a9bf7394fca37e79f7faf3/nologuxumowizizotiretave.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f64fea50374---47411209465.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084e8c09d850---pasisawakinowane.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/38344824502.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/1323365798.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/71818378229.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a59692125be---24838711541.pdfIn PDF document text
    • 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_off0000eaaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C6 10824 bytes
SHA-256: cce6080d4806175e3b79b0b87510a6f5b7821367faaf6ddd797222d61a71aa3c
font_02_sfnt_off00011bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEA 18432 bytes
SHA-256: c810a0c5ac81657547f23c8b196e0f4cf48b2ad51095b0692327b440432f9082

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