Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4b504b4971344b…

MALICIOUS

PDF

90.2 KB Created: 2021-08-13 11:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5640e6058aab124676c93af8d33bcf44 SHA-1: 380f52f70d6b6b98bca16317c42f52fce942dd18 SHA-256: cd4b504b4971344ba5ffcffb5718fb1a3a787aac02e2f5c0a1c6f40da788513a
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. ClamAV and ML classifiers strongly indicate maliciousness, and the structure suggests it's intended as a lure, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://nslogisticservice.com/userfiles/files/98064567644.pdf In PDF document text
    • http://zgkimsteszew.pl/img/upload/files/duzeke.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/6712410901.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/vitaxasufowutuzina.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8466d5600a---35405134182.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ade7ce4de3---77493330691.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7d33a3a71---73256285959.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/80232089468.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/59e52d6b6ad365406e7d6722fde30621/wurilofopugogud.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/d8jtfr166ft2k6luiqfjid27id/zunaxe.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754c10dc12f---4863472012.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f3db990d6---kofixopurutegifotezex.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/pikipegawawifav.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/38768970187.pdfIn PDF document text
    • http://muszempilla.com/files/file/nirozejiwopoxejenipawubuz.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/jinaruwobopokunave.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/29979280698.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/nopikowo.pdfIn PDF document text
    • http://www.asslar.de/downloads/73505375423.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160dfd02e1aee0---13334830182.pdfIn PDF document text
    • http://landpas.pl/upload/file/28629106421.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f436f7e216---81403977854.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/38315413035.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160984340b3f4d---puworojutudugawebekawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+are+the+positives+and+negatives+of+non+renewable+energyPDF 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_off0000fb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11366 16932 bytes
SHA-256: 4c42e420e01d419eb19f1195b75c6844667f5e3c73bc91b4df3a4717004996e4
font_02_sfnt_off00013f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7C 11176 bytes
SHA-256: ba8a5404ae4285aedaa6ae3f6ef68dab0979f4737a4ff557843d49c0f2d87d8c