Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e49b7bf6410c56…

MALICIOUS

PDF

86.7 KB Created: 2021-09-02 07:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f9dd21076843f51e4ce9d99d7319f78e SHA-1: 67834778c6b94099d6641cbbc300895cb5925d99 SHA-256: 51e49b7bf6410c5611593a48a37d2a461431376794ccf991edb0e754171c7d03
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to host or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88735d010f---52182317890.pdf
    • http://fobas.cz/userfiles/file/876515649.pdf
    • http://massintech.ru/img/outer/files/76744245577.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/s471blp0f8h6elsu5kdodautpu/mewirawuxumuzinokepoz.pdf
    • http://a1-automotivegroup.com/upload/files/sutuxizubopujofowi.pdf
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/wiwapiliziwefawig.pdf
    • http://pechati-piter.ru/userfiles/file/36673320427.pdf
    • http://bigpictureresources.com/userfilesbigpicture/file/galivazupujumanuxojo.pdf
    • http://kim-clark.ru/files/file/17116754411.pdf
    • http://cpghollywood.com/userfiles/files/jufewukizuduni.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5179ed61ca---37200507470.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c62d82fe2c---ragotaraveme.pdf
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210720192901.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608918fedd182---fimovivadubepetuvizeko.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/5b423bfec97e53156ded51e83d907a5f/57306727474.pdf
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/10987252274.pdf
    • http://arredamentoambienti.it/img/file/44058497965.pdf
    • http://poorclarescork.ie/images/66636111097.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/kgtdbosnp3849fbft8sah1c0nl/4161603948.pdf
    • http://owv-sad.de/userfiles/files/26649604278.pdf
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/tuvosunilozidaler.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c49dfbd0722---kinakoxemidofunizogelar.pdf
    • https://www.studioline.ie/ckfinder/userfiles/files/tojezib.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/b6jao2g7mjg4bdr89bqsk173u0/70733321056.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=what+makes+up+the+sun
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecfc.bin
9cd9902549368a439bc0de229d40d44148284bd98b600c19c5530e50f7639f2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xECFC 10344 bytes
font_01_sfnt_off00010432.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10432 16792 bytes
font_02_sfnt_off00011c44.bin
8d0ce6c2fab0530b6286fbe867a7d3c275137258d9b6c7d155f7b6c399e34850
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C44 18376 bytes