Malicious PDF — malware analysis report

Static analysis result for SHA-256 0023eb83e8ae4d20…

MALICIOUS

PDF

91.8 KB Created: 2021-08-01 16:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d88964aedcfb72699820c5a057bbb7a5 SHA-1: 81e02a27076d5298059d5462ad09f6c4f7b1aa15 SHA-256: 0023eb83e8ae4d20bdb0cd11b041300171fe2df510385bf2ef6e4746527120c0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and link farms indicates a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6166ea19bf---2825188899.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8a5be8620---7819492253.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc19d651cd---58247848139.pdf
    • http://jaluzipro.ru/public/userfiles/file/polasuzorujamulalomix.pdf
    • http://polyalpan.hu/_user/file/fekupozexitogaki.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a2c17fc76---rawumisakelologi.pdf
    • http://stylekd.ru/files/vopozidunefa.pdf
    • https://xistenze.com/files/files/xejubekas.pdf
    • https://bleikss.com/userfiles/file/namuvevijib.pdf
    • https://aawyx.com/sites/default/imageuser/file/99548853543.pdf
    • http://ilkemymm.com/image/files/69393517497.pdf
    • http://amandamaitland.com/images/file/669738173.pdf
    • http://saokienviet.com/uploads/image/files/sosezoxilemogoluxux.pdf
    • https://ddshower.com/ckfinder/userfiles/files/pumosubobekafasutugalude.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/7tr0j3imajjv1lgkbud5ufidhq/wudotuzutivazegu.pdf
    • http://wannawwannie.pl/userfiles/file/78280883584.pdf
    • https://aimhc.com/userfiles/file/pumutalatavobopegemeraval.pdf
    • https://bilalyapidekorasyon.com/userfiles/file/66021487677.pdf
    • http://lblussana.it/images/file/detigimud.pdf
    • http://bukhatirhomes.com/userfiles/file/51654853401.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160872584a16de---27295857505.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/d7a1fac858729cff885b84f5deb44de6/lovezadis.pdf
    • http://grafiport.com/userfiles/file/5511576275.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=tesco+mobile+ireland+internet+settings+android
    • 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_off000101ba.bin
81ead98f5d9fa0f5bfa4e9e867fd5d429a71c4dd34ec6412312863fa87dce01b
pdf-font-stream PDF embedded font (sfnt) at offset 0x101BA 10816 bytes
font_01_sfnt_off00011a6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6C 16792 bytes
font_02_sfnt_off0001327e.bin
39bb78fdb52a69ebf33aecc0152ac97da99b01f01b646b57eec225381652a202
pdf-font-stream PDF embedded font (sfnt) at offset 0x1327E 17328 bytes