Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b2e3ae8a58bb7af…

MALICIOUS

PDF

85.5 KB Created: 2021-07-07 02:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28379f0bed84fa494f0b1f0952174c30 SHA-1: 9fce278f5598758f79a947ce20500e9d163fdf25 SHA-256: 7b2e3ae8a58bb7afeef1642d2331f95f6b3ad4466e14d277cf5e280cc5d10b79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/7d2a9426f0dc203dd7c37cd6e821817d/47454368359.pdf
    • https://footballsod.com/images/ck-uploads/files/62879488361.pdf
    • http://janandpoos.com/clients/872640/File/vebipekuvumegetedixavifiv.pdf
    • http://sam-global.info/files/file/kaxopitatalaxudojif.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2388a2694---zowuzugeputa.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/58dae907ce975373701622e60490f344/wezebifoxosujiv.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608643b2ce65f---luwinimufu.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607001360a86f---47507248918.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/a2d377e71fdce4f8dd38a709cb624a96/lixopoxirojipogepuf.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1884ac734---xilekaxerajojomitozoka.pdf
    • http://come2menorca.com/images/file/36361706767.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e25b9ed2f2---fazebalupifunik.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/q3k1vu2d82reiehetk5bjo85pg/fifetokoladimosemejonedok.pdf
    • https://mfdesign.hu/files/file/71218835434.pdf
    • http://deurenhanger.nl/userfiles/file/69847903269.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/m3hl8d8b8l809q05o05b5h0f4e/23924575321.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2a4ac9e406b1ad8c2bf7eab6fb05ddf4/85207515674.pdf
    • https://dodatnojamstvo.com/userfiles/file/fiwidofitaripufekarituru.pdf
    • https://himarco.ir/basefile/himarcoir/files/zonugexefexev.pdf
    • http://weifong.tw/fckimages/file/58507434797.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec69e9c0b1---nerofuwoditi.pdf
    • http://quinta.cl/upload/files/lezejasumubegobodalev.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/a472b8463a7dcfcd3273e97ce4ff807f/mepurolikajuriza.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=personal+code+of+ethics+essay
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e444fab759---50734898091.pdf
    • 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_off0000ec42.bin
c8771d5cfe54122131eb865ef473a2f2fe45317a0c16895a693daa2b4cc7f03f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC42 16312 bytes
font_01_sfnt_off0001167e.bin
75e328591522a44ad214be57704216a614df94cf2b4131e08390a61ffa4da784
pdf-font-stream PDF embedded font (sfnt) at offset 0x1167E 10688 bytes
font_02_sfnt_off00012efb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFB 16792 bytes