Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b50f16be7a55a1…

MALICIOUS

PDF

85.8 KB Created: 2021-09-01 14:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5214a7d44b90cb94d4bfb9dff8c53b4d SHA-1: ebfb6c0ba87104371119a158a3b431c326a28020 SHA-256: 24b50f16be7a55a113282dfd0cb4dc7fcf21f8379802c3be497010de55594eb9
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to compromised websites, likely intended to deceive users into downloading further malicious content. The presence of a 'download button' lure reinforces this phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160783abda6da9---86314765143.pdf In PDF document text
    • http://argyleliquidations.com/userfiles/files/34834957381.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/482935065.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c088f3be3d1---82341770023.pdfIn PDF document text
    • http://servmed.net/userfiles/file/70784307509.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c07130347---wuxituxobedupudisaf.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/asfo8afih7ier6g8tn1hidukh2/puxagerosejuxewemodilu.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/74023254558.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/c1dd47fal8t919ueve0tqb7c9i/nulepajawo.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f837ea7c10b---86179801525.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/de565b76641230bf4b6c867c435cd30f/nowigepunuzebisetif.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f69df32b8d6---jelufone.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/31508674530.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210621_154231.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/gobetorekuvip.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/kukuzitirone.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/91098101057.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/488562625.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/edd07182bef618ec292b7e1b71329b06/kudagujodanewexizobam.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/17906329459.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6eecac560---gifuwokakogunigoketevanu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a027ef2e0---wudamoxigimuxoguluxati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=free+fire+3rd+anniversary+ringtone+downloadPDF 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_off0000e81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81A 18104 bytes
SHA-256: 727c29a07352690e30bd02874fc3f2ccdefaf85b5e8621612c801ef0b026fbc8
font_01_sfnt_off00011766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7D 10944 bytes
SHA-256: 41ced866b5235d158df87585ffbdfd877fb3fce56ee7fb70faca5438a8956a35