Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c45251d4439fbc7…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 02:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0a7869441a491e985a34a63f676cf0ce SHA-1: 78ad03b97ca08a85872bdb58f38ebbf293a5b96c SHA-256: 2c45251d4439fbc79c7d4de857d3476b596e3484f0cfd5209a9188a2180568d8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or SEO poisoning lure. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://przyklejki.pl/userfiles/piminorotid.pdf In PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614084ebba361---99254153590.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/mexowadalemibonopumazawo.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/jelesepilorenuriwi.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/ravoziluwakizomedojeme.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/rakutamuvejukuro.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/nogetunipexoreli.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/14734948429.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/97821639314.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/sazowafibenafuxemamekije.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/nabarifef.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/92966644054.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/67305798158.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/gusiluxukurumejipupetu.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/38923913871.pdfIn PDF document text
    • http://workontext.ru/media/file/dobebiga.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/ee9ebe79ebad43c1e4f44843a67d9444/96656830117.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/27208691940.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49805430379.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/4a8ace4f665732c48b2742dac0154e11/kexiwomuxaz.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/32600549339.pdfIn PDF document text
    • http://rhondachem.com/d/files/54247168372.pdfIn PDF document text
    • http://apothepharma.com/upload/files/xolunawivijezuvezufolirav.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/ratakalojura.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/51202472009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=forza+horizon+4+demo+download+androidPDF 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_off0000d7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F2 17520 bytes
SHA-256: 977415b973422003bae0299eb5ce707cdf0dbd6e5f09741125522256f645dea9
font_01_sfnt_off00010537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10537 10448 bytes
SHA-256: e160f930e4d059ac920beb0c89fdebe0c285e06520d548f955ba158e3296af5a
font_02_sfnt_off00011cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1