Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a4591eaa32729a…

MALICIOUS

PDF

95.6 KB Created: 2021-09-20 13:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d643913d713ca8d02f12e459938c24d9 SHA-1: 8cf6c7f31f867d7669a78c1719c40eccaaece7fa SHA-256: f9a4591eaa32729a9812e0d6bb870583cd24ba6ff86a92db8d1fc87352d62330
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous links, including one hosted on a compromised WordPress upload, suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/bfa0ff29a71bc8c80ad841b91d91c487/rosugilelalek.pdf In PDF document text
    • https://cian.hr/userfiles/file/solekobokokerubus.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109030638158398.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/80156118227.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/zesivizokogusovomexokexu.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/71310918050.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135686d92860---dogudoluxobamavezalezof.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/20359128670.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/3584214544.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134682e2f998---71919811870.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/95820984091.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/dawufut.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413f24c2759---samumakivimisajoputume.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/72047287458.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/17927295573.pdfIn PDF document text
    • http://www.520amis.com/upload/files/dofuvoludozikofib.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/ganaf.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210902170555.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/110029257.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/furajup.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/fuxinujanomikimigigukida.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/zamepituvulokane.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/8319423570.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109132247041984.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/nokiganerowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=dragon+city+game+mod+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F6 23896 bytes
SHA-256: 2758bcc344683388b94a98bc4161ac8bad47268b2792d7e2564efa00520dbe36
font_01_sfnt_off00012174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001398b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398B 10848 bytes
SHA-256: f31518ad6a408658aa41a5b60c2f2ee7e58c8dcaa36430e73382426c01ba3ebe
font_03_sfnt_off00015259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15259 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_04_sfnt_off00015a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A50 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d

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