Malicious PDF — malware analysis report

Static analysis result for SHA-256 74aa949e09bd683a…

MALICIOUS

PDF

69.8 KB Created: 2021-09-18 06:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8be8a62325aa9ef3a986f2ba4d9dc597 SHA-1: f12c1ddbddb8fb01c0b57ff2e336d2a36a31a6a2 SHA-256: 74aa949e09bd683af477ef678f408ab178eb92618554b0cb86076204a3c0a3e0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or are part of a link farm designed to redirect users. This suggests the PDF is intended to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=where+is+trash+bin+on+android PDF link annotation
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/fetedukiw.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/72103292462.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/97505651312.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/31689512841.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210909022334.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/rewafakanirenewire.pdfIn PDF document text
    • http://www.ezmoving.com/file/78438670314.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/larazirulovalev.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451f307f96d---sizegelam.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/25328250827.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/db491bdc8f0b7df6e6e506b9775d023e/26296454430.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/xagad.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140b034ad5a6---kowikugono.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/94364824697.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cc404d6d1---32758038995.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446956e5bed---zukoxujigemimipedeniw.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/divekifanopolupojar.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/79509645774.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/wirowegunalolonopud.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16137e56e97804---50947970490.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/xoziduda.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/98124741082.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/8722785313.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_off0000b1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F2 10432 bytes
SHA-256: da26ee7db8a286b7de95a8cfbb3d94d439b5bd0e75713490a2a33bfce2c2e725
font_02_sfnt_off0000e18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18F 15844 bytes
SHA-256: 29002191613a8577f236e52df7189ea9e7de4f210551860c87d88ca0655d2f92

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