Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8a40255b28e15c…

MALICIOUS

PDF

85.4 KB Created: 2021-08-27 22:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d75aa01404bb633d3dcb3f9bb714a5b SHA-1: d3562e536f277adefeed0dd949c25515f0f49d4c SHA-256: 5d8a40255b28e15c931e052b3e4302ad7f51f7ad54773118e873a3c3f5afeb31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, indicating it functions as a link farm. Heuristics suggest these links are used for SEO manipulation and point to disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pixomot.ru/uplcv?utm_term=thoughts+about+self+love
    • https://securityguardsupply.com/php/uploads/file/nukake.pdf
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/gemokogubo.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/77300e585276a3840ec4fa07aa0dff96/45757139148.pdf
    • http://veribase.com/E/file/vokobeveposa.pdf
    • https://beautydent.hu/editor_up/zoraxodeko.pdf
    • https://zoomkish.com/basefile/zoomkishcom/files/kowosasepepigaxipij.pdf
    • http://ohappy.org/userData/board/file/kisididubi.pdf
    • http://ekbdrive.ru/ckfinder/userfiles/files/lexonekikobalikodiwo.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/87a67b6d8ada0bde0698c0ed19fceb9e/24519076099.pdf
    • https://sce.tw/uploads/files/60e8486f48c99.pdf
    • http://hotelgiottotorino.com/userfiles/files/21190097718.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/k44hfh2d30e92h10qqdru5kbv9/14988659475.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926de41428c---xonitajegula.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/69981075555.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609993b3d5053---66496233236.pdf
    • https://sedefartphotography.com/resimler/files/loranu.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74fd5598a9---25804115842.pdf
    • http://iwishop.hu/file/2217111417.pdf
    • http://vitanova-cattery.com/upload/file/ruvufadepidaposinarige.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e13380cd9d---67172657938.pdf
    • http://baldonimarcostudio.eu/userfiles/files/kixefigeserupijamexexan.pdf
    • https://astek-telem.fr/userfiles/file/visirunikusevi.pdf
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/58052988918.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1f38eb0f3---27679749407.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_off0000e580.bin
5914de86f3e05fb9894faf7f3adae98d36b4cedd36b5ebff053e4b10784446e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE580 18904 bytes
font_01_sfnt_off0001169c.bin
d768b1b1778954417238a01536e2d29d2ed85172ec58b5fc69b1b27bebf3ead4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1169C 10464 bytes
font_02_sfnt_off00012ea2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA2 16792 bytes