Malicious PDF — malware analysis report

Static analysis result for SHA-256 af73a0f0421b17d9…

MALICIOUS

PDF

87.7 KB Created: 2021-10-04 14:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0ed17300d76be0d7040376f1f574c976 SHA-1: 45478530ca36423904814fc9d3143b5b87e89e71 SHA-256: af73a0f0421b17d9e7b6030711c65c5a2dd4b3ac52fdd1523b53db9eb80dad69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting an attempt to leverage SEO or compromised sites for malicious redirection. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://wastran.ru/uplcv?utm_term=exploring+creation+with+biology+test+answers PDF link annotation
    • http://sakulchaiplace.com/Uploads/file/62365106583.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/0c1bc1a524cebb564aa0b128adcd3357/33381409539.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc73878da0---39503257363.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/vibezimibowage.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/kixivipijajiroju.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/nukusumifi.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/cfc830e231426b0daf72e2e0382c4072/jovopapesavafeler.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/zuruwa.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/21426724506.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/16077608393.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bbb42715e---41258939695.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210909085955.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/82498860662.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210930_155612.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/1519557945.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/20108193466.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/wudifapobuzowaju.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/65478748816.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/24378661380.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/sekivotedanarekuzogewa.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/zopudozosilanilutezuzazo.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/7394054361.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/71852080571.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/nivexit.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/tebelewi.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/dopejodojorelutod.pdfIn PDF document text
    • 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_off0000edc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC3 11080 bytes
SHA-256: c5727bf7431ac31754b7abb53f4fbb093a70ec93333e466af288602f76ee758f
font_01_sfnt_off00010767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10767 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F79 19224 bytes
SHA-256: 31981379a2bc809a066e089744166bcd73376108c76414768fca0c95146f34b3

Open this report in the interactive analyzer, or submit your own file for analysis.