Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae85b6dfa41ce7cf…

MALICIOUS

PDF

71.2 KB Created: 2021-09-24 15:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 21cf2c2ef267d166d9392e91a2078c7d SHA-1: 88d90d6257e042ce9793de3fb8bc659f7c373525 SHA-256: ae85b6dfa41ce7cfeafaef1e6350f39db8a5636a16819714630b34c94dd489c7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to redirect users to malicious content, such as phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://fasson.vip/images/editor/files/26267159122.pdf In PDF document text
    • http://liubeauty.com/luutru/files/97348635479.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/moromepuxikazoz.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/likifokugumudaf.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/63114550475.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/69023910842.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/gesonojudefipoz.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/43322382365.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/f5f941fffcc6070186dbab435e336881/5784044594.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/29346698518.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161435d5f2098a---rixikexexelatefofagop.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/zasagolisedoraluvop.pdfIn PDF document text
    • http://glassick.com/userfiles/file/34743413022.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614058d705d3e---kegase.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/lafuz.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/51381536911.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/kivixodobave.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d76c4aa60---49093635394.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1630490303.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/5flrqvr9quc29jjdg62tb6e46g/sixamevi.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16140eec54a592---57075671197.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/84151335982.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ea68lldh1490qle7im1aosfsj6/gopiwezapezibafixo.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/35338742188.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/34330062612.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=hidden+features+of+android+11PDF 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_off0000b4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C1 10444 bytes
SHA-256: 924a2b5fd75a3ed048bf943899239fe8f2aab1b92fcadd9cc9a01cde59996b9c
font_01_sfnt_off0000cc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC91 16584 bytes
SHA-256: 981e76e403bcb99f21db4e738fb4b8e398af529560dfbfeea09f539adf075981
font_02_sfnt_off0000f6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1