Malicious PDF — malware analysis report

Static analysis result for SHA-256 f573df1dbee08218…

MALICIOUS

PDF

162.1 KB Created: 2021-07-03 13:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e109ca891ebddb0cdbe633c19ab9f9d SHA-1: 4d93d63dd349b9ee6c174ac7193db7feb9d5984b SHA-256: f573df1dbee08218c78e2eb58e7f8acb18adbfe793924d2562dfd992babe628b
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection indicate malicious intent, likely for phishing or to serve further malicious content. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and potentially engage in SEO poisoning for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9334

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://pistant.ru/uplcv?utm_term=how+to+get+rich+without+getting+lucky+pdf
    • http://beateromer.com/bilder/file/vorivirafubiv.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608416243a6e4---difatofobukutetobe.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dde1564968---piloluvokotosixakem.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/c4e58c3a966d9121f5da460e4a0e9808/36506884791.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a517b9f220---vexirerowitekajizeduzid.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/vsufmvfs6c19j90m0db384kb82/zoturaxapu.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082f21ee5a81---88159647384.pdf
    • https://weddingitaly.jp/images/file/xalabomeziregepog.pdf
    • http://thinhhoanggia.vn/Images_upload/files/kudezagubaxijuwip.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dee74d8cfa8---81610531018.pdf
    • https://hotel-la-licorne.fr/userfiles/file/43796010886.pdf
    • http://mclarenquartz.in/ci/userfiles/files/92922774405.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072284ba2407---40216707883.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4ae482ed---rajogilarevogikogaruz.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160757f28ba2cc---pojovopov.pdf
    • https://topupdana.com/contents//files/vekinemika.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d947a18c899---14690601955.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/4f66a576d4c8d0d44540fb5ebdaa2bf9/xutujezavowedemadenivofag.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c76bcb569e6---wejesozofefivo.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/b81116463ecf9b8813764f23eac35f49/sufijanelifekijogeb.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/xifozizagasimo.pdf
    • http://studiotecniconuti.it/userfiles/files/27744238857.pdf
    • http://parishad1925.org/ckfinder/userfiles/files/71301673727.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/fa4bb444b4cad27fb01aad5336570fe1/32856099377.pdf
    • http://gallery4walls.com/upload/editer/file/gifavadezurazabimasujom.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607254a53d9e6---mowemilejilitimulebev.pdf
    • http://nesthomes.in/userfiles/file/julefarebeporagimosis.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_off0000fc6e.bin
fd0d1938b52169ee154db586b18ab04fd213d989674152d3d4926d4698ff54bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6E 10952 bytes
font_01_sfnt_off00011584.bin
cfae766d72780e4123f8995b97018734d40fcfb8f1877f38a0d474cd0282911e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11584 116076 bytes
font_02_sfnt_off0002333b.bin
e341043e809e5b4c6ad70792e925b76c50297f5cf7397092762df892cbe50bb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2333B 16760 bytes
font_03_sfnt_off00025f24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x25F24 16792 bytes

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