Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6f87550c8167b5…

MALICIOUS

PDF

70.6 KB Created: 2021-09-29 01:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8adce11af16fb80b42758ad605927ec SHA-1: c1ee3e5353b94c8c5e1d16aa0b181e391f0ba4dc SHA-256: 6a6f87550c8167b5d5082d0b36df16a73afec772a1f96b890ae07eb86821dfa9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or link farms. Heuristics indicate it's a link farm on disposable hosting and points to compromised CMS upload storage. ClamAV detected it as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious, suggesting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://aneri12.eu/res/file/wepix.pdf
    • http://jamalcar.com/userfiles/file/nifabugasedazid.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/d5d992bec36e0a55ebec414b4e6c5dd0/bowujavimodofikelowek.pdf
    • http://ilkemymm.com/image/files/29962740115.pdf
    • https://thietkewebseo.com/webroot/img/files/67978820240.pdf
    • http://artstudiodesign.it/userfiles/files/diwuzejimuzerolazijesir.pdf
    • http://3e-recycling.ru/app/webroot/filesfiles/54490473521.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614fc3dfeb5a7---livimuxojogara.pdf
    • https://salvatoredivilio.it/userfiles/file/tesulevofakiwilavabini.pdf
    • https://guanlai.tw/uploads/files/202109121910353449.pdf
    • http://gzpropellers.com/uploadfile/files/31698867213.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/bda1c231905f52ec6c966e2f7e2e296b/kosesakewose.pdf
    • http://sieuthihatgiong.vn/webroot/img/files/xonelewozafegisolopod.pdf
    • https://aparcaderoshaddaichile.cl/uploads/images/files/40764684671.pdf
    • https://dol-rtknetwork.com/uploads/files/vopasixow.pdf
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/dizemexuk.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/6f3ba356ac246273e8d35171e220952d/jagifolexozuso.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16153559a07615---jasigalubavibesu.pdf
    • https://bestofbucerias.com/upload/file/siton.pdf
    • http://doors.syskon.eu/ckfinder/userfiles/files/risetuxesujaguga.pdf
    • https://realxenon.ru/uploads/files/farozozox.pdf
    • https://tp-pos.com/uploads/image/files/70932275585.pdf
    • https://inwestorfinanse.pl/userfiles/file/pebupoputajewodum.pdf
    • http://hasyo.net/files/file/gafogibir.pdf
    • http://ryyw.com/upload/files/2021/09/202109182224101799.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=best+wallpapers+for+samsung+mobile
    • 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_off0000b12c.bin
5303f64b85a7cd89dd1042ca8b44fe4e762d15162dde3e666f3dc6ebd1cd67ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xB12C 11080 bytes
font_01_sfnt_off0000cae2.bin
aca3282ce8dcbb865e4436ffaa0e3b44bb13e6c3449a6c25e9b74a7a9b9a045a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE2 15788 bytes
font_02_sfnt_off0000f313.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF313 16792 bytes