Malicious PDF — malware analysis report

Static analysis result for SHA-256 917828b4054dc726…

MALICIOUS

PDF

88.4 KB Created: 2021-09-16 12:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5406e35d9be9231d6ec0a39a2abbd5e7 SHA-1: 768dfc99c0ea4d2462ccf1e99ecb7a4e2cd57781 SHA-256: 917828b4054dc726a6285f986b0b3a52e4e02052752a2308005af9b299150ff3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to compromised CMS upload storage and disposable hosting sites. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://inwebjor.ru/uplcv?utm_term=vellam+movie+watch+online PDF link annotation
    • http://brickchamber.com/ckfinder/userfiles/files/81601272742.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/a3edf952e9d3a4a36a36d0890d51c336/sifun.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/lavotej.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1ad32977f---57165295067.pdfIn PDF document text
    • http://synphabase.ch/upload/file/pokusepujubulixisivetun.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/587ff30b58183c999cc40710a1a672fa/22127435816.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/jonakukaxuj.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e64894f794---lugubuxixowabimilidid.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/41628418424.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/88828768528.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/gazageve.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/57747629517.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/wasunobejode.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/29955367538.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/kusujafekaril.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/sesobixegijolupivoridege.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360d3418155---janopa.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/4634387331.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/62475837496.pdfIn PDF document text
    • https://huanghecables.com/d/files/56611982159.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/99212611342.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210906_164243.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/51159772921.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/68187490944.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/22209303484.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_off0000f792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF792 17628 bytes
SHA-256: c3be7f2d855c62ffd8c555487bd0640092550b3d6f5ce2e0e3bdcdd42ad1b749
font_01_sfnt_off000124f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F7 10348 bytes
SHA-256: 16df6ed832fb20755a9e71ccdd8846597cb70073bafa87b15ccf35c14a77a7ae
font_02_sfnt_off00013c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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