Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42485648d5efed0…

MALICIOUS

PDF

78.0 KB Created: 2021-09-04 19:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a8d52633ffef98c64a1259b293e8a714 SHA-1: a28b4710cf1de48fafce150d2bac9fe3886e6916 SHA-256: f42485648d5efed0375b5c46b90ca3e330371a45a4b946216eef81d0f1aaab22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that point to various websites, many of which are hosted on compromised WordPress installations or disposable domains. The heuristic firings indicate this PDF is a link farm designed to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://allytemp.ru/uplcv?utm_term=leadership+styles+pdf+notes PDF link annotation
    • http://progfin.pl/userfiles/file/78584938367.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/36060366750.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/c703cf7f2cbe0e52a579f2d5081f147e/kitilef.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/3bbdcbdbe307167a0b543fa9cbee89ef/45736228555.pdfIn PDF document text
    • https://777mto.info/contents//files/31679887430.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/fe82ab85f0c91fffb8ad16f3451a9f82/40556200531.pdfIn PDF document text
    • https://afayl.com/userfiles/file/dodada.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/tejiboru.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/24qqtodttpn5altbuhrrs4vkmb/rosasuz.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/sexidalabiwudafe.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/85739398257.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/gvunmv9d8pnh3tirghsparcqe3/76086256269.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607411e41cb0a---65140372786.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/15188415112.pdfIn PDF document text
    • http://mp-journal.com/media/file/32481219261.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/21959933876.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/filavimavakufuzolodiz.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/fakifitezisaxamema.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/kozob.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/moxijufugabepuxufuta.pdfIn PDF document text
    • https://dcimx.com/files/bemumuxokomer.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/3oqet01ahvlcmfe353e3faepcu/58486399615.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_off0000cf51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF51 10664 bytes
SHA-256: 2e39bc57eeadce4c9816c32603dcd355d13b2515874cc573b608dbc4bf14d825
font_01_sfnt_off0000e7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A2 16612 bytes
SHA-256: 7525d2254a781aa24c558dd32c8c28eeb6e42596469c11e976385f5ad2748ea6
font_02_sfnt_off00011268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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