Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c10499958a9ddf…

MALICIOUS

PDF

88.3 KB Created: 2021-07-09 02:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ffb892ff942df81da17ccd03ed4bc7a5 SHA-1: 22a117a033e222a7c303d05a1c4402a23fa0ccc4 SHA-256: 56c10499958a9ddfcc411b9b9ccd4b3635648546464e956b0380f616602f07e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://drafthe.ru/uplcv?utm_term=volume+of+a+three+dimensional+figure
    • http://abnicum.com/files/file/lofadekepobewifoje.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a44f42d479---98003887586.pdf
    • https://vicotelecom.vn/static/source/images/file/setaposojod.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d34cab5a68---laxowupudimojigezitanenof.pdf
    • http://nfraccon.org/userfiles/file/datodusamevalukemuto.pdf
    • http://geometrarontani.it/userfiles/files/sidiwiwusatinutujuku.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/c9n44md4nm7okk0r1sv5jhrhv1/fivenofawasawewobajoluwu.pdf
    • http://alliance-ic.ru/uploads/file/malapat.pdf
    • http://heydarbaba.org/resimler/files/41058386693.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6c0b107dd---41394240515.pdf
    • http://aj-logistics.com/stock/userfiles/file/5650065676.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/moatq6c0mkbq6v4dmdf5cngkqm/44623748871.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160917d8d59145---14375153374.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/e324b03d636104bed989538efed2b647/37379742324.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be487e2f82---71933700963.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/a0b1b7dad9ae96027cc29b07900fb3ac/sujonetuzijaduj.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/1bf40459c8bd66b0b41097da493ee2f5/25904162526.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16099dec041727---kovexor.pdf
    • https://superchills.com/userfiles/file/rafulejekuzefuvoxedoku.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717c68047ab---36232622410.pdf
    • http://sam-global.ch/files/file/18633023449.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/funukobibid.pdf
    • https://thietbiytedaibao.com/media/files/29290741716.pdf
    • http://alarcon-v.com/editor_upload_image/file/sotukoli.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfb0b1729b---pefonexavupodupetozej.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec1d.bin
009aa99132dc6155d135e113eeaea4232ef7c8decbd213ceb6061ea64e1d662f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1D 17196 bytes
font_01_sfnt_off0001197e.bin
f9adc6e203aed7ff3fe6f3380d4b8b3fe46fef0b028858785df2766c43335d71
pdf-font-stream PDF embedded font (sfnt) at offset 0x1197E 10872 bytes
font_02_sfnt_off0001322c.bin
0d2a1c7db24576eb9ae9d051c24fd0c715444340adcdf1e985f2860fdd21a2bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1322C 1980 bytes
font_03_sfnt_off00013b46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B46 16792 bytes