Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf03c83eefb035f…

MALICIOUS

PDF

85.7 KB Created: 2021-06-30 09:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1bee99ebed3ff99489477a0a40335afb SHA-1: c7a5d22fd90718a4609cc44a3a694d43853e9729 SHA-256: 1bf03c83eefb035f92239e2dd1eba63f324bf310b73c562dc217c63175cb7ce7
156 Risk Score

Malware Insights

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

This PDF document contains a link farm pointing to multiple websites, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL targets suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/8495406465187384def220b2caab0cb4/pujomafirosimik.pdf In PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/94962614491.pdfIn PDF document text
    • http://focostrade.com/files/20210620042618.pdfIn PDF document text
    • http://guowangcable.com/d/files/460246467.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/ce383b89b57b3f44da28e4a2ea555520/fenusadewusalom.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-30/20210530041344967986.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/af71764f8bd9adf1c0eed6898e4b00bb/sovakot.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/98249871511.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16070d2d2282ee---86684686664.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16096c5e1831ad---97157410874.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/od1spjan63h5h4eb25f5qemtig/34710441996.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29029446983.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/66e0f517ad6abe9b5c4443fe0dee4a33/70000142742.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/409bf1cd322f1f98b78ac11ed2be7654/zafuko.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b569bc2d93f---81257392533.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/29601778825.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607439f192a43---felivimale.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/0f0645fa18f2b3a76853edfbdae042cd/senagekorokofazaj.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/xedup.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/dutusuwudidogis.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080e60d2900f---90065819494.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/10mh930pvm6rg215i3he1v53v0/munivotarewaponarok.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714c9f37e0a---91921729370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=mic+injections+for+salePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 10452 bytes
SHA-256: 617e8c25b3a8ce3374ab39153b715ecace63d39244ccaeec885da96e77aa799b
font_01_sfnt_off000103dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DD 17220 bytes
SHA-256: 9b1c3990fc9efab6cf7e0aa120be42de3c0738508efddd598c09717fdc1bb9a8
font_02_sfnt_off0001302d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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