Malicious PDF — malware analysis report

Static analysis result for SHA-256 a442a86eb173ea87…

MALICIOUS

PDF

83.6 KB Created: 2021-06-25 15:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f48759d7d435b23384c5242f3765cd5e SHA-1: d49451e0295db0c46ae18e55552f900446cab811 SHA-256: a442a86eb173ea87621ed8b2a41689a9a9d29ff2f6324866d07377d8459ee78a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a link farm hosted on compromised WordPress sites, directing users to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple compromised URLs points to a coordinated effort to distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c39ddf96fab---42386683959.pdf
    • http://macap.nl/app/webroot/files/userfiles/files/zewasolilepo.pdf
    • http://zwickerfoto.hu/_user/file/finirapiw.pdf
    • http://lapenya.cat/imgjovesnaves/file/47555210999.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a297d5b1971---vukeg.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16092b90f3be30---vofedufeb.pdf
    • https://synodradomski.pl/userfiles/file/pazetosanujesafolosikiwu.pdf
    • http://akinmedikal.com/uploads/file/jejawipurifuvuxuw.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/1704efda5c6626b91c049fe178f285d3/43884709351.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607868308e0b1---19316219644.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e38bf27b93---zufak.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160803c1f5ae06---jusegemamax.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607840aaedad7---28761677400.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6eceb8ebfb---wuzegolagovabesogibolon.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/ed76f41552e3c559f1fc07f1bd6b779e/maxewu.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609493eb4fdc6---48949558096.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=download+def+jam+for+ppsspp
    • 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_off0000e1e9.bin
729641060fccb429bca926e8741fd33486efdbe7310facd943b9a45ad040355a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E9 17472 bytes
font_01_sfnt_off00010fdf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDF 16792 bytes
font_02_sfnt_off000127f6.bin
538a50f46cc0eeec1d63d952d7c8688b0dc6e14ec18c90012af66e81103cf10f
pdf-font-stream PDF embedded font (sfnt) at offset 0x127F6 10688 bytes