Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8aa87e11a1c8a8…

MALICIOUS

PDF

87.5 KB Created: 2021-07-14 06:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8be51d561f4aaf36346c5df9566f42fe SHA-1: a2b2b68f78326905c8d593a2add89bdef2dece8b SHA-256: 2d8aa87e11a1c8a83b3356ee20162f2c5848a9c70cee451985ad8081c27c5cc5
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of multiple malicious URLs is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=given+two+terms+in+an+arithmetic+sequence+find+the+recursive+formula
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73a918f427---73989931051.pdf
    • https://drsoleimani.ir/userfiles/file/45064439526.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/02190bdb249f074c2c1273644e79b281/81511145508.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16093c9c6b3829---20192348689.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/38b2cc319d9fbc45b82aa957ff93e244/fagatoteronewurixujenir.pdf
    • https://zold-kommando.hu/files/gerezixobimetofutevam.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/6vq1ooou18l9rdhsopmb29h78f/gawajasu.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcca7b505e---pukovelu.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/n89b07hj1buamvv1atb4tin949/7396224276.pdf
    • http://bc-arman.kz/ckfinder/userfiles/files/62019585477.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07e552da98---nobowazavik.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/e69bae86fbf58d35035f598a05bde716/64504130135.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/55d701bb58c58128e1ee79f769e9f4e6/judirirabumugasukafonixa.pdf
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/5427625562.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096dd0d74121---5213032232.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/dfa5f317be20899c26adff396d113383/27638387203.pdf
    • http://thuduchouse.vn/pics/file/sagebegulemopuxekenituf.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd2fbcfe20---muwev.pdf
    • https://sharenkon.com/files/timukajodulawasiniwuza.pdf
    • http://donghozibistore.com/luutru/files/vogefedusuzolagan.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/q73815tp947g0jsi0dd8f41ju3/tasibim.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160993f16ef40b---doresidajisurap.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/mno7a67vcsv1t5puii5ej03jk7/31652685911.pdf
    • http://kursadowicz.pl/Upload/file/xirapijasamuzisutufi.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/wotuzulo.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_off0000f08c.bin
08da0287bba707ac998cb103c3d89634daa364ffbbadb743e4f79bfd032d2d5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF08C 16788 bytes
font_01_sfnt_off00011c0b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0B 16792 bytes
font_02_sfnt_off00013422.bin
3c4ae7fbcdafa6474cdf3e9388b56cb95399b3fbcc4ea57edc65a719e35628ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x13422 11176 bytes