Malicious PDF — malware analysis report

Static analysis result for SHA-256 d990f3a1d6864544…

MALICIOUS

PDF

79.9 KB Created: 2021-08-11 21:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4236e94750f2dd15be8675fdbb23e7bc SHA-1: 537d86026a48fc6e37fde5eecd5c59e54bb53f7c SHA-256: d990f3a1d68645444e5db0408885714c6286ab0e891d7c13b48e5db583e0d33b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://global-brand.net/userfiles/files/10263672914.pdf
    • http://jn-zhsc.com/upload/bitiguduwawanapeladiz.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074a2b0103f8---kufogebipabidoxixino.pdf
    • http://expertsystemgroup.com/file_media/file_image/file/nasusavowoni.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec417feeb92---duwalatizede.pdf
    • http://genbreedpublisher.com/files/upfiles/file/gojidesavoxapuwuval.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/61291609563.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16098921e531db---vapijulibubija.pdf
    • http://nowator-zpu.pl/userfiles/file/79361833654.pdf
    • https://suncables.co/images/file/60738708151.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/42c8f2f6789976e4fa79850fef976d67/nabosede.pdf
    • http://sdes.in/uploads/79864254284.pdf
    • http://kezmosas.hu/files/file/biwipemob.pdf
    • http://hillandcunnreunion.com/clients/864369/File/dasiribenokokeva.pdf
    • http://saga.diamonds/uploads/ckfinder/files/zedadidubozizakanazumo.pdf
    • https://hijaulumut.com/contents//files/25603234898.pdf
    • http://weingut-suppan.at/files/jobunarotutusilim.pdf
    • http://interstyle.org/content/xuploadimages/file/36289415802.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/1d8771a35acf27057a3807121a70fe3a/4219575808.pdf
    • http://pc-driver.ru/userfiles/files/29918947012.pdf
    • https://gestionarival.com/userfiles/file/zivedisuxokumum.pdf
    • http://uptindia.com/newsimages/file///31295815645.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/12a6d020e0c3614d1bb903fa991e9732/logiponi.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086940165ee9---73580451362.pdf
    • http://fotografoenricogiampieri.it/userfiles/files/pemogawodomiligano.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=combination+circuits+worksheet+answer+key
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1302fd5cd6---divosorojerizopatalu.pdf
    • 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_off0000d2d7.bin
471ae1f374e68df866a0613a58ac6a1ecd8e63a0caefc65c507626b3e9a28f10
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D7 11012 bytes
font_01_sfnt_off0000ec60.bin
07e4e78ea82984ef3b92c36ef40c140576db344403d903b745cb0a845a200088
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC60 16852 bytes
font_02_sfnt_off0001186f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1186F 16792 bytes