Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa82531fa95ad16a…

MALICIOUS

PDF

74.6 KB Created: 2021-10-01 11:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac1f784af2b9c4c6297f24da912a7a88 SHA-1: bdf1d6cf15f231e1bab43a0909ed52b10dcd88fe SHA-256: aa82531fa95ad16a1862ce550907e439b576bcd84bf0350fa18811c4c31f582d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a link farm suggests an attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://drafthe.ru/uplcv?utm_term=clash+of+clans+apk+13.369+4
    • http://oskarmak.com/userfiles/file/61984128262.pdf
    • http://pretaporter-pegah.com/userfiles/file/dekawugajizasosoje.pdf
    • https://emotionalgift.com/ckfinder/userfiles/files/vedof.pdf
    • https://washlounge.in/ckfinder/userfiles/files/9030810899.pdf
    • http://commune-bourre.com/userfiles/file/guzabemopelafazig.pdf
    • http://vinhhangvien.com/upload/files/73582222011.pdf
    • https://oxi-dental.ro/imagini_ws/wuguzagawukemiwesopaxuzi.pdf
    • http://greenhere.cn/upload/ckimg/files/202109181756266151.pdf
    • http://dream-mebel.com/pic/file/nobevaxer.pdf
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/pujevewewogagenoxewutu.pdf
    • http://maternites-catholiques.org/ressource/site-image/files/mizubifixalipesem.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150f0afd5e16---direrobogusadas.pdf
    • http://erictex.com/ufiles/files/10718218840.pdf
    • http://stroykap.com/application/views/stroykap/userfiles/file/wovum.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161527400a3d86---jigukubesajufejenakuluna.pdf
    • http://www.sm.ac.th/ckfinder/userfiles/files/81845907924.pdf
    • https://kinhdoanhvaphapluat.com/img-dn/files/71110333630.pdf
    • http://orosweb.hu/ckfinder/userfiles/files/4165981114.pdf
    • http://vagtteam.dk/userfiles/Files/91099997482.pdf
    • http://bebsulmare.com/userfiles/files/minunuxawidof.pdf
    • http://esrafisek.com/images_upload/files/83962188856.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16155f8965d58c---kigava.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_off0000bd35.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD35 16792 bytes
font_01_sfnt_off0000d54c.bin
676dee0b747cc6b891f321c822000b4b5ace4fb701a19db18014a94ea83793ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD54C 10980 bytes
font_02_sfnt_off0000eec6.bin
87730b958b29ff823a6502c2dd02e7d9ae7a3311e3c0e59367cdcbc5347fe035		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC6 17824 bytes

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