Malicious PDF — malware analysis report

Static analysis result for SHA-256 44557db7b6d7111d…

MALICIOUS

PDF

93.0 KB Created: 2021-08-19 05:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 53e27afc11a8f31b2bdf8ae407284534 SHA-1: e549de6b1d1a33914a268427be78137019abe832 SHA-256: 44557db7b6d7111dcced80a84ef5582b772848a03dd528e1cd6a984461d42c16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://pjkconstruction.ca/images/file/83096965521.pdf In PDF document text
    • http://benevolo.it/userfiles/files/11062603442.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/wovudawonikab.pdfIn PDF document text
    • http://rafaelokazakov.com/file/dokexum.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/webukafakuvurulunuk.pdfIn PDF document text
    • http://naucseto.cz/storage/rilukisewozavekom.pdfIn PDF document text
    • http://faxik.online/ckfinder/userfiles/files/27645652765.pdfIn PDF document text
    • http://countryroadssiberianhuskies.com/clients/e/e1/e1b2222506e4b6fd6c510396e08362d3/File/kunubolodowuja.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210727_BD55FDCF3EA537AC.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/a3d22031d145f03be63970400a91e66b/fedulanenololex.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/49b3m5qhq6pb68nb3sp44b49pm/wikamomowared.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/24878601745.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797b7989957---xaronajozedud.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f47c267b22---87564250202.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/zewuseperoregosusudidu.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/9q43qe2gvukhavs8f25ss15qu0/8830257383.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210726044320.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/4f5cb1c05e0a1500304679050e62bb97/47750280668.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/rfj1iecn5g4ifnbp11u77a21l1/wutonivexo.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/jobaziraxovomexak.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c78d8fa6c---vawizowizop.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/66448687991.pdfIn PDF document text
    • http://ibb-online.ru/f/file/zubunapulubaduramakot.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075ddfcd3b8a---matuzinegilixukabazukop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+train+flemish+giantPDF link annotation
    • 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_off00010636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10636 17484 bytes
SHA-256: 92ac056bb90df84c86d79fa7c5994161af1796cdd92943a15163b3dc7d01f06c
font_01_sfnt_off000133d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BEE 10736 bytes
SHA-256: 7020fe23cbcec9178b8730fc97259588de464e08d61fe7d2a9f9eac4920ba4f9