Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d9ac0f3d3a6b8c…

MALICIOUS

PDF

73.5 KB Created: 2021-06-28 04:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea725d27fa08c9e055da00d79ed4d36e SHA-1: 2dbfadc06ec4cf77253c93a389bb9fcac3119d54 SHA-256: 55d9ac0f3d3a6b8c1ddbabbed5f6ecf77a266140506665f9d1bb15f96eeb3c5c
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised CMS upload directories, suggesting it's designed to redirect users to potentially harmful content. The presence of multiple distinct hosts and the use of formcraft plugin uploads further support a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1af3806233---wogasewakarirosigixa.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adfdf2eb0a---48415175718.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072f918cae5d---21730377777.pdf
    • http://zovsh.com/Uploadfiles/files/59652164996.pdf
    • https://samsungklimalar.com/upload/ckfinder/files/suxadesarutubeso.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/50626f4d971b5723e25c2a62affb04e5/50482445264.pdf
    • http://etabetasurvey.com/userfiles/files/lisikenogokovimevuji.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821571d1024---81969588842.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160871efc96b08---79892111981.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/b4ab0843012f2000ec26bf7de67e9619/37511370808.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/00eb8rov01hoatnsdmci4fdkcp/77472247240.pdf
    • http://mega.kz/media/upload/files/66925342378.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f50beaa2f3---lepowufutome.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608898b941d86---78904311060.pdf
    • https://grandhotelbulgaria.com/userfiles/file/24108503819.pdf
    • http://aucoindeshalles.fr/menu/file/15309634303.pdf
    • http://master-sign.ru/ckfinder/userfiles/files/femidexaterutewibazeka.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a862230911a---72595349653.pdf
    • https://bodegoncriollo.com/userfiles/file/40021861803.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/77480afe1f135140c10b27ef0ebe8d48/torulobolibixotazuduriso.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e64b06740---91685740709.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/dfbim9t7a0nnv6cf3k5shi3sna/lutefijipojavozisiju.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=my+glass+is+always+half+full
    • 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_off0000bffa.bin
a7bbcfb7157c5cdf5011896816d74ba0094bd353ea385fce3a1869a5eecba0e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFA 10232 bytes
font_01_sfnt_off0000d715.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD715 16792 bytes
font_02_sfnt_off0000ef27.bin
195416c29d8d2d2805b59bf4b40181d884d8bb69957f7766338bbb219d6ce655
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF27 16136 bytes