Malicious PDF — malware analysis report

Static analysis result for SHA-256 d95d31fb91607c4d…

MALICIOUS

PDF

85.6 KB Created: 2021-07-12 23:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 655a73b714723128fc14e6df7bc37af9 SHA-1: add3918e61c3be1e92bb4ccb85405f116c219f9e SHA-256: d95d31fb91607c4d993ff5222f7235fdcefd0158302257bdb21d3e7b929c106a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous links, many pointing to compromised WordPress sites, suggesting a distribution mechanism for malicious content or phishing lures. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=free+pdf+editing+apps+for+windows+10
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/03537b520e8769258f123be0418c8563/kugakiluvogebekipujef.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9783a5a3c---bosakiviwutupizixad.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/165b64790e914ed3e1725e722238217a/71366734947.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/6e994127d857f691d9865cb75aef08c7/24941485158.pdf
    • http://tamlaproject.com/userData/board/file/josasoni.pdf
    • https://noddy.nu/images/file/9724354058.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/33c20080da0d81c21ea25eddcd3abd69/xijovesasokoxilagafiwivi.pdf
    • http://krevue.cz/UserFiles/File/nidudufoguvizumozifi.pdf
    • http://www.awakohchang.com/image/upload/File/1916630340.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf6f651bb2---90895990164.pdf
    • http://arohitourandtravels.com/userfiles/file/bonigoketovudebetimul.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/838c8f49f7d64abb6039284db44821db/32576384844.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/fb2ff477f4715de69ed7a6a2af1ebac4/42618893471.pdf
    • http://africa-emergence2019.com/userfiles/file/xivazatunozumivasol.pdf
    • http://imailbox.nl/images/uploadedimages/file/golagifodukigazur.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608559879485c---70477651481.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160cff1633a918---65691899502.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160806d34a7c4a---jixijodafik.pdf
    • http://bowlingkillers.com/imgdb/files/62238683361.pdf
    • http://airelimpio.mx/img/editor/file/75950907270.pdf
    • http://bostonmentors.com/userfiles/file/19628358969.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/vm4uqdnt90opur8urlpbkla8qi/pufetegomekebezajudix.pdf
    • http://france-ex.com/images/blog//file/31795381700.pdf
    • https://tedvandergulik.nl/userimages/file/piwedenejisufenumosaw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaaf.bin
60dcdce322cc9c73f0fd4a19c15c17556b8b6de6dde3e158623d00a0d16f8f2b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAF 10864 bytes
font_01_sfnt_off000103c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103C5 16792 bytes
font_02_sfnt_off00011bd7.bin
35713e013fff28729eba5d65aad122ea36865b7eaa11d2ccef8a6936b666945c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD7 17404 bytes