Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a6347a3ae1b903…

MALICIOUS

PDF

87.5 KB Created: 2021-09-07 23:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5eba8cbbddf3b2399b136c9ba79d3740 SHA-1: 6747adbf2b0bf30730268e6162fd24d8f1a01c0a SHA-256: f7a6347a3ae1b9034e66fb619f5f8e0ffb8de40f81c7fc9a087b2828f7b5b85b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the heuristic firings and URL analysis point to a malicious document designed to lure users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://auf.vn/wp-content/plugins/super-forms/uploads/php/files/qa9j24dlrq8pgahdu3ludcshd3/xisinuruxawenasinixe.pdf In PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/43080869134.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160825c668afe0---juxideguxisi.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/gusonorejatosolemabak.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/warijulolasere.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/50066803269.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/e58f534c53e7131ee189b080de53ef51/79627975184.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/2716981655.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/ginoza.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/kewital.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/wagazewu.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/niq2531o9ml3rit1sf6tqa3oi7/degogepoverozafakojafu.pdfIn PDF document text
    • https://stopserv.ru/files/file/70977799418.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/robako.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160abe81f40bed---xilod.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6194439e00---9787554882.pdfIn PDF document text
    • http://cochu.net/resimler/files/ninatagaxojijije.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///fazumepaxeronasa.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/xajazubizefuxuwigi.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/80620710769.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/m23o5bjuskf536linpte294tng/rujuwagime.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/vagare.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/18131853752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=policies+and+procedures+manual+template+wordPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCA 18488 bytes
SHA-256: cb379d2ca995906c0ee055d2b13b646cd9cf7e295145b25ec8e7e4c3c3755ae0
font_01_sfnt_off00011ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE2 10864 bytes
SHA-256: ae144da3837e202a423fb146b216a75b9ff3904b6344ae63fe9f32be3b4c8892
font_02_sfnt_off00013809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1