Malicious PDF — malware analysis report

Static analysis result for SHA-256 908c2969f415ba1d…

MALICIOUS

PDF

85.1 KB Created: 2021-09-17 00:41:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 568b0e25d8c5929d88578daac4c236b5 SHA-1: 9c21d5ee986fccf8e4c156235593532d8f1c4d0b SHA-256: 908c2969f415ba1d2fb3974e52a4902e72b072bda52fa58788ad417d60551813
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to a variety of domains, many of which are associated with link farms and potentially compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The file's structure and the nature of the URLs suggest it's part of a campaign to lure users to malicious destinations.

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://irlanc.ru/uplcv?utm_term=backgammon+android+and+ios PDF link annotation
    • http://cx-gl.hu/images/files/34288581309.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/68556503360.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/fojokuxipi.pdfIn PDF document text
    • http://fpole.ru/sadm_files/welizifopefodo.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/91445595417.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/dewusobefigexojadizulovop.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/keravulad.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/dizotiludumupiwojedizoni.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142fa8ab2f7c---kovosezativ.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eecd8aaf89---60217494223.pdfIn PDF document text
    • https://network-italia.com/file/tederaximoxawaluzis.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/62c112408eeccb6b2770a37bd8d684fe/xerixegavikepe.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/saxegevozagipavamipipor.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/nowemepijen.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/17815082918.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/9812333869.pdfIn PDF document text
    • https://ms01bet.com/contents/files/jolikujib.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/96435527252.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/zubegusubolefuwo.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/39854844189.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/nakibafetazewapofete.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/5776658459.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/xuwedejebeweni.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_off0000e774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE774 18308 bytes
SHA-256: 81e69d5d9f1fd08399ed6a15416ca441e6ca6a6ca8b7fe4cc46364ebd027287f
font_01_sfnt_off0001171e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171E 10584 bytes
SHA-256: 652690f5bfffeb5cefca2a51bdfd9f82d9d73039a46d1fe9aa2fe146f307416f
font_02_sfnt_off00012f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1