Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98ae9a1ffcf1148…

MALICIOUS

PDF

86.7 KB Created: 2021-06-25 17:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58cc092c4fff66b6bff46663ef878e78 SHA-1: 6dec5e58ec7cb043e3d1b32f82a5821048c2cbac SHA-256: d98ae9a1ffcf1148b6f278d615716507baad49a7432f68d23ce4f3f95d9e2c3b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress installations and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://elite-nails.pl/Upload/file/kojefagolatipetigat.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d14e9b9c---73521155457.pdf
    • http://townsendrogersfamilyreunion.com/clients/9/91/912616e09393d205379ff76530a10a1f/File/80647116890.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160bfedf979277---58444507009.pdf
    • https://nepalimodelagency.com/userfiles/file/sepaz.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0117468ab---gerodubogar.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/71a1274c5b46a53a4da1a3169f646efb/jepubape.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/43be3247bd3bb845f72edf920bee9a9f/xejowinakez.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8740d1ffe---wotezamuwop.pdf
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/lidebibulita.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bb1bd1921---dazirukazugifevafobukis.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a44c7361465---tajifebufavexoluvadusosu.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960b692513b---dazevevex.pdf
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/rakamitano.pdf
    • https://robert-zauer.cz/userfiles/file/35484292759.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae045d8b9f9---2026539511.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/fessi7lr0sjs62teeqt3u5v54s/xatumamekedekezomagusirun.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607497691f876---zovefijoburadusuk.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160789a229b877---94324748083.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a12851e13---29540150743.pdf
    • http://amdind.com/userfiles/file/15980451222.pdf
    • https://fwullong.com/upfiles/editor/files/16978560486.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/lu3tjsb2kni1on41gm7gbhkci1/5141909332.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=double+vision+eye+test
    • 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_off0000f19d.bin
8778c5dc418421ef70828f989e2fb6a0154d1a1fde81b0490a897d905890e055
pdf-font-stream PDF embedded font (sfnt) at offset 0xF19D 10260 bytes
font_01_sfnt_off000108d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108D9 16792 bytes
font_02_sfnt_off000120eb.bin
4fed7b043d8f4691ef5dc4e744b7edf4d1c814738143e21679cf7c7a2de8968b
pdf-font-stream PDF embedded font (sfnt) at offset 0x120EB 17296 bytes