Malicious PDF — malware analysis report

Static analysis result for SHA-256 23040629e01fc923…

MALICIOUS

PDF

84.2 KB Created: 2021-09-01 18:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fbf98b29517a636a15a88d84b4a8bbd4 SHA-1: aa127ee56f90b076076bfb5574b14a06a97a64d9 SHA-256: 23040629e01fc923d2164fe3e41f35b9599c1104cd86fe1c180e50a7948f57f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/1ea844d7b6b9e7dcc822a0faf1c27266/ruvixarope.pdf
    • http://thaide.org/userfiles/file/vejitabuditikofe.pdf
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/buxovukufuxubobake.pdf
    • https://nutstudio.it/userfiles/file/4928319878.pdf
    • https://beruanglucu.com/contents//files/60549569369.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/3s56vg984dhq4jclqqr3sh9265/69969289714.pdf
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/19451224739.pdf
    • https://huanghecables.com/d/files/55084765802.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/076e1ea912fa774a082fcb435be71a95/95420465555.pdf
    • http://csc0851.com/userfiles/file/20210609160010_282z8h.pdf
    • http://hb1004.com/userData/board/file/54178533545.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088af9f223b6---rudimulijexegotiginexoga.pdf
    • http://mkpstroitel.ru/upload/files/nedusovola.pdf
    • https://alshaabcoop.com/userfiles/file/86389973951.pdf
    • https://sportcity.bg/webroot/img/content/files/komenobix.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0dba14efa---damar.pdf
    • http://lws-realestate.com/userfiles/files/roxexotoripupolavikenad.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/jvv6n8gbuifi5gcv7doknit214/gitexugofafatuwigavuxij.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080627ad2365---57535420363.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/500c7d1c23ac576a630434757c3db392/89363761628.pdf
    • http://asremajazi.com/uploads/files/10190071737.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/9d77cd3fc04d2aae7ce9e59923d5e518/duxobenagiremenixuf.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834a35787ba---34874136632.pdf
    • http://litho-and-co.fr/ckeditor/upload/files/fomiludaf.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d1e8800508af8d1de0adddc7e600d413/67493548249.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/3q9ahkjevdsq044qpngi55d11d/83614532021.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=find+the+circumcenter+of+a+triangle+whose+vertices+are
    • 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_off0000e06d.bin
3761760aee70e0f83f01c46586c9e4b9d1795e3ee05fa71c54ecf9389e9ae122
pdf-font-stream PDF embedded font (sfnt) at offset 0xE06D 18136 bytes
font_01_sfnt_off00010f81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F81 16792 bytes
font_02_sfnt_off00012798.bin
ccd01f2f7a2045631ee1fb1039f1be6aeae8829872cf59678fd69d44b531cf3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12798 11152 bytes