Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f30e6553564e5b4…

MALICIOUS

PDF

79.8 KB Created: 2021-09-12 13:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1ea06c449d19e1ab21740004e52d4634 SHA-1: 19989bc0090b1a6cabb455d789fe98aeaba032c0 SHA-256: 2f30e6553564e5b4ebff9198a2b3d8e38007822df26ba10be5234d8587ed5d60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. One URL, https://huntic.ru/uplcv?utm_term=download+windows+10+64+bit+1909, suggests a lure related to downloading Windows 10, a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://huntic.ru/uplcv?utm_term=download+windows+10+64+bit+1909 PDF link annotation
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cffaf196a1---kigonozudogoz.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135116a45f99---9667518638.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/32493360908.pdfIn PDF document text
    • https://matricula.arendic.cl/files/bixurinedosabo.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613914af5fa90---67391504563.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/tolasu.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/zafudemeworijobosi.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/rufadunuwusedelorad.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/turepuwamogan.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b523dfcd---44663242349.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/zixubewode.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090612364973499.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/15701402193.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/63091807024.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/furifinabokosurusifarate.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/fumadowuxurit.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/leradaxetofiruzurodimozur.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-11/20210911102308725863.pdfIn PDF document text
    • https://sambelteri.com/contents/files/lisuxiluvovezifijepatode.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/26063639326.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/5540753559.pdfIn PDF document text
    • 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_off0000cd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6C 19096 bytes
SHA-256: 8072a98828943af2eca062d734d63caea680c878e65e5afe105f7d1b26eae7eb
font_01_sfnt_off0001004f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11866 10824 bytes
SHA-256: fee8f16e0b1d219ba2e05d1bff73a6f150da5f889db513ed9bf7c53c56ab81e1