Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fdd9ed1ad9f5053…

MALICIOUS

PDF

71.5 KB Created: 2021-08-30 19:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: d85495c0e57219ae1b9e1866f84b021c SHA-1: 8f514b546bd10fc9aa537fcb6741d93de2eadf17 SHA-256: 1fdd9ed1ad9f505363b89744289cbb5ab120ed6daf4af3a2844b181ea8da2828
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting it's used as a lure for phishing or to distribute further malware. The file's structure and embedded links align with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://crysiq.ru/uplcv?utm_term=kinesin+and+dynein+movement PDF link annotation
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/b5dsnqqki2bp7uqtnekl2ufee4/65347364941.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abf0b67ed4f---18031648600.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1608a439d43a93---nigiwibun.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/jivojuloxovavule.pdfIn PDF document text
    • https://razredna-nastava.net/files/ronogudomemobeburizuk.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/970849aa533d85d11811b2df157caf60/faruket.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c384d3771e4---43725226813.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/jowemukexewoz.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a86bea604---26742784985.pdfIn PDF document text
    • https://hagepoorter.be/files/files/54006936647.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160766dc84887b---dotodoteme.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/tevepukasopekejivopupavat.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210525072757.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/hhd0mdkbp62gsbs33qcm5br1oo/radasulotub.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/qol4fucgj4nrt3usgiuio9cts7/zigudesumapuzijufapud.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/divugigatafetuj.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/varume.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/iefmlae6hbmduaqg4bfitjmhrh/bozavozi.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/82371164217.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/nepaxutawodoniligopo.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/42098551948.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b84e2a51a---pivuveninevibuj.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fb8280721---pekod.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/bafuwuk.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/jamakujebiduviwarap.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/polupefasute.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_off0000b88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A1 10436 bytes
SHA-256: d85ebbd39d03da61314d94127549b08757dde8dd3a07e92894814494e51812e6
font_02_sfnt_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 15952 bytes
SHA-256: e3dc4ed45ba08565c803675194ddbc258e2ca344c18391ba0c7469926fcb204c

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