Malicious PDF — malware analysis report

Static analysis result for SHA-256 f051c840d025e62c…

MALICIOUS

PDF

69.8 KB Created: 2021-09-10 08:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f16beaa6907808cb41fd43dc3be0175f SHA-1: f825a7a983509269071870c88b3d75548615e010 SHA-256: f051c840d025e62c6fd9e56a41a14a1a1eb48cc6351a0f771010e42ed486b229
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/7qg47dofke8u5crl55tupfj811/petisuzezozanogodenodu.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613383a631e54.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/38279438837.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/fepavikulewokuwizo.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/zomurepijexamemi.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/werune.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/5524690963.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/58636783970.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/40031083285.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/zumejas.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/97277917217.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/zakegekiwefekevos.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/35080085968.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/fimobuwexoxexak.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/puwinib.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3628980604.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///48786909085.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/subamumadegeg.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/79766016000.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/taxepawitanedamoliz.pdfIn PDF document text
    • http://sinostandards.net/upload/files/45526251535.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/2830c5a7e94b357d7607d733ac7cce60/51481417236.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/50444186906.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/32630794240.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613270d8a741e---lewojoreruf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=last+day+on+earth+ultra+mod+apkPDF 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_off0000b161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB161 10828 bytes
SHA-256: d65a60c35ac10f808a92be3fd881fb46612e3bad880d7e7cc37fcbb7cdf7d79b
font_01_sfnt_off0000ca33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA33 15708 bytes
SHA-256: b52e0425ad06ce6ac5633a2fb796b895ee34bc4eb166bb385b829fc1378dee10
font_02_sfnt_off0000f198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF198 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1