Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba31c0199297fdda…

MALICIOUS

PDF

93.1 KB Created: 2021-08-14 14:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bba1160f0970072edd3f714cc4dae7c3 SHA-1: 03994f91e9ba7811f8106957f83803712bf3b1ef SHA-256: ba31c0199297fdda8cf681a35baf51e961f91d4a4ce3c393e4507a03e4278b8b
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a 'download' button lure further supports a deceptive workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://dansecyr.ca/pdf/file/wilakolovodi.pdf
    • http://kemmurad.com/webroot/img/files/29503133802.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/18f729cbc31ba0bee389d52e90271d4f/72137257121.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/h7c2slb68ove28jiaifae1c16h/fopelupejaxonemun.pdf
    • http://stylekd.ru/files/90929054921.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/gn4v1d990q7iifci4r8rauvub4/46591252635.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7bb1e468e---wofador.pdf
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/tepekiveditojenojuwu.pdf
    • http://vejwun.cz/images/visanabez.pdf
    • http://permanentnimakeup-brno.cz/userfiles/files/juxuxuru.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/s5e78rp3d9i1966nntcau6s8t5/lanavivosanegibos.pdf
    • https://vigiweb.cl/dinamicos/files/file/soberurajowuxaloruzo.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7699ebb969---79804165481.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/93bc074a4126291a7c908d485278848c/xivuzazapabelosevodolivi.pdf
    • https://n-zvuk.ru/upload/file/sofot.pdf
    • http://stauarchitetti.eu/userfiles/files/18828013596.pdf
    • http://studiopol.com/userfiles/files/79735723384.pdf
    • http://consulcongress.it/uploads/assets/file/1717008283.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/4b92aa3f89f8b4e286bd116cba3622b8/17443881090.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/15ensqpmob6j0v05ot1jdem545/95899954610.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/6d343ad463c45d028e02581a971a1f62/15877619053.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/9de3b4c82d98e5a6eed3d2f131d510bf/fuvovutu.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160872f8e25565---latepim.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d773399c4c---66533573864.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/b5697d1ffbf5b8599320b10291e4aedd/webamunaposutezoka.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=coniugare+verbo+amare+in+forma+passiva
    • 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_off0000f863.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF863 16792 bytes
font_01_sfnt_off0001107a.bin
7a03cb13b58eb8a39b92d4030dfa91351cae80db2ceaddd89a079a3c399a924c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1107A 10892 bytes
font_02_sfnt_off0001297d.bin
ff7efef83a55e51d64b41c8ec6c511d50a12571d528d7aa651a8cf94820a16b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1297D 2124 bytes
font_03_sfnt_off0001332a.bin
9c424569168691c7b1088e2d7b6900ebaeac8acb379ad59b7a24864462f2295a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1332A 20620 bytes