Malicious PDF — malware analysis report

Static analysis result for SHA-256 760be10fdc7aca6b…

MALICIOUS

PDF

78.5 KB Created: 2021-09-11 14:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: df81d463a1732c2af405e4ebfb631f0d SHA-1: 7f0a5c8f457eb6c6f7ad74eecc6325ad919db2be SHA-256: 760be10fdc7aca6b0786adcf8a734503a0e428c9eadc4cf2b5aba2c1c2f276d4
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 compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple compromised CMS upload links further supports this, as these are often used to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/91572355832.pdf In PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9025d4fa52e5ac97a5c921c1b63c2ec4/jigutiketozo.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/livobolopotaleletajodikud.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/wejurizudilitozesonuxezuz.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/lezojod.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/7040962126.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/nowetebupewivug.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/74933419797.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/revuxaximadunemo.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/puvobakixikuzex.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/kinofaxubobiwedetudut.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/26927757686.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355a6f7bc50---xepimo.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/90790201751.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/xebam.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/tuwukesozeneguku.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/gobibibulexafizerugib.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/pefuzobepubivagux.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/13428923283.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329868c39c8---19657732653.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/jelasi.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/benuxavas.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/72072823023.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/rupigepevorugarevominuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=off+the+road+hack+mod+apk+downloadPDF 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_off0000ced3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED3 17232 bytes
SHA-256: e2922fb8d6ff93efee29284ccf29933d30b653a9fe78c52da10e07423a3b8155
font_01_sfnt_off0000fb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11355 10828 bytes
SHA-256: 9ad21b427f058e361c6690f05f4c83df7bab222efdacfbe75bcb48af930a96e2