Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c802fd52e65e57…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 07:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 119b227651e3b6158f2cd12a05f064a4 SHA-1: 6eee49243169976fbc48907e6cdd190bc0297c20 SHA-256: f5c802fd52e65e5758d84b7b6e35006720cfffbc9b42d4f3035e2c41b632076f
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms, suggesting an intent to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tlproduct.com/userfiles/file/fasesew.pdf In PDF document text
    • http://vimbark.sk/editor_uploads/files/38849168472.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/ravipiwijebi.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/wipeguxaxiranem.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/05257f8204d9425f2a914f987879ccad/rigodol.pdfIn PDF document text
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/zuvivezeketul.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/fukewurorunojo.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • https://highrise.pl/file/59591743969.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/kamimuzokozefusopoz.pdfIn PDF document text
    • http://schokofontaenen.de/idata/49176944969.pdfIn PDF document text
    • https://777mto.com/contents/files/jujimezirezexuk.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/moladaj.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/61559383401.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613425df5c786---pavukur.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/60704569061.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/31948574894.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/jubex.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/51737251959.pdfIn PDF document text
    • https://epiphanych.com/images/file/vapujexokumogusuneru.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613124293f61e---fidofowevupugixem.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/64543182511.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/69237984122.pdfIn PDF document text
    • http://eichler-kammerer.de/sazilivedorobiruze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pubg+mobile+1.0+download+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_off0000dda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA5 20420 bytes
SHA-256: 3ca8b4387e17a49ab9dabee2ebdcb3462537e465c53aef9258f50746cd42e449
font_01_sfnt_off000112e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B00 11028 bytes
SHA-256: a7cefdf0da68237e2ac5e055d85186b25165120746a18d07400652829d9c8be0

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