Malicious PDF — malware analysis report

Static analysis result for SHA-256 525ac37f947b73ff…

MALICIOUS

PDF

86.0 KB Created: 2021-09-07 00:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f7af477f64e052c80a3866f40438eff3 SHA-1: e54c4f6b14ee177d989c559a0566b218ac20252c SHA-256: 525ac37f947b73ff6faa1a3e0d6d76aa31f0b1e2f4cd02fdb04331e37574ac0a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload or phish for credentials. No scripts were extracted, but the PDF structure itself is used to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://brava-ekb.ru/userfiles/file/lusebivirinusep.pdf In PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/18582705816.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/mitomesoxatowato.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc518bl3enksfn8qmg324aqbqh/49620014356.pdfIn PDF document text
    • http://spakimthi.com/upload/files/nuxivakoraren.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c58e771654e1d9b77a69212848266984/sififokaradawuzedisojupes.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/lebivu.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/ruvozitolagexuditosonuno.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/suzaki.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/sigowepononezef.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/pofenawos.pdfIn PDF document text
    • http://hogan1973.com/clients/d/d4/d4eda5e2427b34f3a15374adde9a77da/File/mutatirojiluxesosagudol.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b5426028c---97870790318.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/dapapo.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/46bf40a433ceda13608fc5cde12c84a3/gukevekagagubafiwopobolep.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/kagimofobedakoxepalo.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/44fdf5053d8b926aedec55e267cd6b2b/14586857403.pdfIn PDF document text
    • https://flyags.com/editorResources/file///24291658833.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/69554234402.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/sixiwefawe.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/k0thd1m67u19rvr18s4790aup6/joxedasoxuriramabakilafo.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/jafodiluvovaj.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3771d1d912---gozozigoboputu.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/58636473780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=mycamine+davis+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_off0000ec45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC45 10588 bytes
SHA-256: 06b032632a1f7572331c21f0706d6ad2b96a3bccc62b5b60e5e5b1152f830b96
font_01_sfnt_off00010472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10472 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C84 17800 bytes
SHA-256: 4bd07c835e1d80a1aab3943bfdbfe5093014ed0c2e91a35f04e8104a72cecb4d

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