Malicious PDF — malware analysis report

Static analysis result for SHA-256 b04077ad579d65fb…

MALICIOUS

PDF

76.6 KB Created: 2021-08-17 12:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: b662a3cec93a10420458b6fd23386acb SHA-1: 88391aeeb2b3eb2c15475783ff3e2e9a35051ad8 SHA-256: b04077ad579d65fb2b9a9e2df1fe2e0b63823b076e10e30621931fb70b04589d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs hosted on potentially compromised websites. These links are likely used to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://medvor.ru/uplcv?utm_term=kurtlar+vadisi+pusu+122+b%C3%B6l%C3%BCm+izlesene PDF link annotation
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/7us5uur60okjl2klkftg5d7cap/25271345918.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/3861499651.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/f02deb2cfad6e15c11348bdf9e5c9a0e/34551183726.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/xawupipekevokajoweviv.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/nesojula.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/wodofobukopazebamam.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/41612055240.pdfIn PDF document text
    • https://epiphanych.com/images/file/99853617643.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/hov236afq78r4bdkkhk6oefi03/xizemilozimew.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56157139651.pdfIn PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/mebenirobaroxaz.pdfIn PDF document text
    • http://combrooncom.com/contents//files/73925454564.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e501f6c0fc---sepudupogava.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/17124753472.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e20d508be2---budinaluzid.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/4d793647b1cb2c1e7c1232f5f8611517/47702836247.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/magimafusimusopex.pdfIn PDF document text
    • https://citytrafik.nu/images/file/makenekobetij.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f93cd55618---disusud.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/3uihge6d8j3k3e01gt1dl4qigo/32814172103.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/544s1ogqc25oi7qjamma4celiu/78820161857.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/64742183764.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160713dc5bb8dc---bidevawavuvodufelo.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/404e30bbf6d1262d184b64203484379e/43238780907.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_off0000c4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C9 11368 bytes
SHA-256: 54dd0279e98cf09bfb5e3cbf58d86fbb8badd689721a3aeb67b1f42c1c593e02
font_01_sfnt_off0000dedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDD 17884 bytes
SHA-256: 6893d3121129fdf2f463865a92d846bcdeef457c37d18a4a4e7569614a58cd9c
font_02_sfnt_off000109e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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