Malicious PDF — malware analysis report

Static analysis result for SHA-256 5749bd35c50390c7…

MALICIOUS

PDF

87.9 KB Created: 2021-07-29 18:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 27790abeb49e58a1074f68b342bcde0d SHA-1: 766b2b7a43e5efe0296a4310032ac01230516ffb SHA-256: 5749bd35c50390c702001f7aa5ceeb617e2e9d8ad5988323d461e6b4200fbe50
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://blsfamilyreunion.com/clients/1/11/11e20eb1c47c3498ff3e66fc1941d138/File/doviwevawisugo.pdf In PDF document text
    • http://gramercy-grand.ru/files/file/fomapixomogubimana.pdfIn PDF document text
    • https://soechi.id/userfiles/file/fagorilexinajuz.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/91788063968.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/413eb418fe1e4759dd30f30e26551a34/79540922912.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/73406663989.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e8c94a03b---tepag.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/79da3tnd12svtt1vn5amkqfkg0/46252800268.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/00ce7334d037b1a0c926979a4afb7de5/90966303087.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/10637096527.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608531c521f32---38582543476.pdfIn PDF document text
    • https://egf.tw/test2/images/file/96248034075.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9d59e3bd2---jonoduzobemuzurozagor.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/42139429098.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/18338728413.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e546149f1---17236222187.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/10430635423.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/95524184818.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/47081012d998d7058ee38f8f0b6eb31f/98313177880.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/efec9acd480ae16e42760f88e8467134/jigerodatifugi.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/3c578bbdd6444620276530a45a43ce56/manabakasixonow.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/tazuzibidavitanapusubofi.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/92941945528.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15428882864.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=moto+x3m+bike+race+mod+apk+android+1PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000cbb2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCBB2 18704 bytes
SHA-256: cfb1bebaa56dbf372651f5796151a567536a9c3f1850ddc22657dc5c11820697
font_01_sfnt_off0000e9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DC 21760 bytes
SHA-256: b90cc2f0e082113d034767cfc5b6c538679fe246965610872c7cec1ee6e382a2
font_02_sfnt_off00011fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000137f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F9 11012 bytes
SHA-256: 0097479863c0eb2a3ff382ca86cd0d632b48ebc8791bfa8d3cf4f3103a00e51e

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