Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85589db979ccfa4…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 15:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 717fae89d33ebcdef26b6693662392f8 SHA-1: 98387f32210d2322e0da873504d274133140c509 SHA-256: e85589db979ccfa42a9a855c8ce822c2ac328511ad23863320f5d8f08b9f06ee
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable domains. The presence of these links suggests an intent to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://baigeleather.com/userfiles/file/lutizekeviwojofipomim.pdf
    • http://ottuk-e.org/userData/board/file/funapelegikagodel.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722186656c7---90747575698.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/148b97473868d13f0ec54992875db63b/51827741527.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b86b8ec72---vatizakizisel.pdf
    • https://bilalyapidekorasyon.com/userfiles/file/bajewuratukadel.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6e10b68a0---dazelirisid.pdf
    • http://angkorphotographyguide.com/userfiles/file/dezuledugagitibuvuwepira.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/9584d061c12b892fc7edf65403b93a4b/33950357244.pdf
    • http://evopizza.lt/ckfinder/userfiles/files/sawowawonewilozetu.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/ditujudexogegejironubifi.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/e23983992965dc40747179a8b5ec7aaf/58299901808.pdf
    • https://nacionalequipamentos.com/ckeditor/uploads/files/liwizatu.pdf
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/72009494241.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/f1b1e6d8e8251a79fbd42170012a1da6/33530600078.pdf
    • http://pelesiuvalymas.lt/i/File/52093575689.pdf
    • http://zabradli-znerezu.cz/userfiles/file/94818155758.pdf
    • http://twtipa.com/upfile/files/2021/07/03/sugotaligurusefababexuris.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16093a35feaa2a---62029627510.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/emvgpaojpho31usicl397gf0l6/nafedelilarajoteg.pdf
    • http://suacuacuonthanhhoa.com/upload/files/nufediguzinaxuxalemarated.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=nutricion+deportiva+pdf+2019
    • 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_off0000d49b.bin
e5fb77643ec9574899e9e102c976dea59955bbeab4bf08a126f95e9b2a2092a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD49B 11004 bytes
font_01_sfnt_off0000ee67.bin
97fe5c9b690930b2665bbb0bea67c1fcff9fcc14a5f42fe7d4848a036419d8a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE67 19380 bytes
font_02_sfnt_off00011fae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAE 16792 bytes