Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f0a15a78dac92d4…

MALICIOUS

PDF

84.4 KB Created: 2021-09-07 03:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f76bde5f7d0e02cbcd981da09971f2b2 SHA-1: fff2bbef1ca6989234883a84000b90d2077b657c SHA-256: 9f0a15a78dac92d4c764bf4d2df0128ae9f4e0bf8527ac773848279051674382
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress installations and other disposable hosting, indicating an attempt to distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded links are designed to trick users into downloading further malicious payloads, likely through a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://al-bandak.com/userfiles/file/dokeliz.pdf In PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609765ccd75bf---pimakuvawolesuvilovidofo.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/lafuxiriboxodafovoditizu.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967e1cc8454---71916199800.pdfIn PDF document text
    • http://gibisch.com/files/files/lanozona.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/pr8lkm9qj1voe3p5jeegkk9cpu/42074836010.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/49dks6e9rooc5prbkret6l6b9h/83294336053.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609109c3a318a---pubikorudumoxafawot.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/5a1a3f303ffdad157801458290d19e8f/5401060940.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161242da7edee9---biwexigurobibojanoruxa.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f784bc172a4---kaweponasufaxosa.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/5012870177.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/88140620116.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/kolenamogixakevupotoweba.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/7511575430.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca906ad083---40210268775.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3243e47d388ae723c96f254969439ec5/38344428203.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/puwosovewomit.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/1n58lrmkk028i3v059epvt93ki/46571719623.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20217181143571306.pdfIn PDF document text
    • http://richwoods1969.com/clients/861079/File/juxogevituworo.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/falegoxapujume.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/51251265387.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/f4667e7c80d7b32db5404c89d6d90b13/bifutenutuxudemerasoguw.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/161004f9f7ecee---debinulosujigab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=esl+games+176+english+language+games+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB92 10980 bytes
SHA-256: 32e5ea910fa20c9a294e8c87bd93eb0b6f2d7b41102e5e201c42dd0a826cf9ac
font_02_sfnt_off000114ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AD 18412 bytes
SHA-256: 90cf03687567f05b36420703c0b86bc92c5460388efb77e3cccb88ad06f68535

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