Malicious PDF — malware analysis report

Static analysis result for SHA-256 846d0cc11adbaffa…

MALICIOUS

PDF

85.9 KB Created: 2021-07-10 05:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6bf0f148c1520c5591554185b4c07abe SHA-1: 56661153854f53772550a39494f81afe4ea8718e SHA-256: 846d0cc11adbaffaead1f1cd6448b98494035f131de6d33d57e53b3b63e919c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised or disposable domains, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as a phishing trojan. While no scripts were directly extracted, the structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/93638057283.pdf
    • https://artasedanasingaraja.com/uploadfck/file/17842802966.pdf
    • http://unsersohn.ch/images/file/ravosito.pdf
    • https://lawina-radom.pl/files/file/52304809238.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/folitipuvimebejowutisagaz.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/a0b3052c5ffa17562ea2e64eb09cbe5d/3802752927.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/cadb61fdf832193e2ac1ba48f10c7eca/nutani.pdf
    • http://arqing.es/ckfinder/userfiles/files/86409825160.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/tpa61scobcv3614c6aea6tq7r6/85819544788.pdf
    • https://proia.bg/userfiles/file/reluregepumosima.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a60b405495e---malufetadisogoro.pdf
    • http://bahattinburyan.com/userfiles/file/958106210.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcbde26792---vabadepivonotofubo.pdf
    • http://kingsfinancialconsulting.com/userfiles/file/17771342259.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085c3a75c659---95520588496.pdf
    • https://weilaimachinery.com/userfiles/files/42789163425.pdf
    • https://varbackaforskola.se/ckfinder/userfiles/files/mumewulomekirovimujamup.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16077250630ab6---jixirozir.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f0432f44c---tizilosadalute.pdf
    • http://kyanite.tv/userfiles/file/31648404173.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/dc0850a7ac183df6e6c547b68c0afa9e/90074830506.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c38392bb34---81122069883.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/56ff41aff56633d75175615e62b20014/25681562314.pdf
    • https://dalilak1.com/userfiles/file/betozapajugogidoxekup.pdf
    • http://j-club.eu/userfiles/file/54112265532.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb8718c518---zomuf.pdf
    • http://deasreunion.com/clients/860224/File/judunaxidofudefo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=look+at+these
    • 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_off0000ebb4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB4 16792 bytes
font_01_sfnt_off000103ca.bin
8369320cd8d4b143fb7d9bc66407afb8777e093ff869f651779d4ff725f3a737
pdf-font-stream PDF embedded font (sfnt) at offset 0x103CA 9912 bytes
font_02_sfnt_off000119de.bin
75e4419ca46ddadff79690470d616dd070a1f0585c7b35c73bd9679f8ce089ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x119DE 19656 bytes