Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa87010270895d00…

MALICIOUS

PDF

72.2 KB Created: 2021-09-17 05:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98cf2bde121da2a23d0e40ae012fa1df SHA-1: 92b0ad2c825f19d0dbd34abe295849c15a07db44 SHA-256: aa87010270895d007507e7eae0c358c8bd4e8e9f6acaa1d066359c507153b152
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF link farm heuristics further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://tpk-m.ru/files/file/mofesunebira.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/nepusixoxil.pdf
    • http://agama-rc.com/upload/files/712106432.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5da0a7d5c---japamatosewusoxemegoxos.pdf
    • https://hoatuoi360.vn/uploads/files/taturar.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312ac15f5db---jejuwinuzisosise.pdf
    • http://netflor.pl/upload/File/17686241458.pdf
    • https://tvsporedi.si/vsebina/31499767797.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136c5d867751---61529154188.pdf
    • https://sofanet.ro/ckfinder/userfiles/files/nivag.pdf
    • https://szekszardportal.hu/userfiles/file/13940095120.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/be478539222aff4e25c541a585f785b5/91370348075.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613472b918cab---84879004064.pdf
    • http://yujinpharma.com/upload/files/kegijonufuwukipi.pdf
    • http://afghansolar.com/userfiles/file/34977273223.pdf
    • http://boekenwinkelindex.nl/images/uploads/28050489829.pdf
    • http://teedinmaesai.com/user_img/file/fivitaroti.pdf
    • https://lecormier-menuiserie.com/www/upload/files/47252918173.pdf
    • http://chemtron-vostok.ru/media/file/77002593595.pdf
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/fakanivegozada.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b777e3d8a0---givevi.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1614032b323a6d---kifobexasotedoxunemus.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/21655b1f2aecc295a9bb2d324bcffdef/fasifu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=telegram+for+smart+tv
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb56.bin
0bdd4f8ac0995e722badded8e1f2de011d6adde63baee55c6ba69edc376816d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB56 10392 bytes
font_01_sfnt_off0000d2f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F9 16792 bytes
font_02_sfnt_off0000eb0b.bin
644c3cd325cecd197a202ce50f9e50291e9e503a1b3d670ebd98441974142f90
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0B 15760 bytes