Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7f699ecf3525033…

MALICIOUS

PDF

80.5 KB Created: 2021-09-21 03:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 526870a2770bb87c9f4054ac9585ffc2 SHA-1: 7c0c0889ec0500a2450243c4c5221a50935dda2f SHA-256: d7f699ecf35250338452f275a83519fe672fa88914e032afbc984e11ed957a23
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDFs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malware. The presence of a URL related to 'photoshop 2015 crack' indicates a common lure for software piracy, often used to distribute trojans. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://ksi-system.pl/editorfiles/file/getukasub.pdf In PDF document text
    • http://www.addvanceo.info/userfiles/files/fatikexizadofamabiripog.pdfIn PDF document text
    • http://arucax.am/user_images/file/9158603291.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bdbd808a5---45350769434.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/20000226193.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/venuzozoguwuz.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/12338862693.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/porefisoditudaw.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133ef8476b2f---vizepopuvet.pdfIn PDF document text
    • http://guowangcable.com/d/files/62349659256.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/83191931919.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/6586426135.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/25473055879.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379f5ecc86f---ludazuzobinoxa.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161453136df7fa---mefotamu.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16145459a61c86---dowonoreru.pdfIn PDF document text
    • https://btegypt.com/file/54678343535.pdfIn PDF document text
    • https://magatek.com/documents/file/mogepuxuva.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/bemipikidowuva.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210912175242.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/76362601182.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/javurumaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=photoshop+2015+crackPDF 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_off0000cb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB73 21404 bytes
SHA-256: c09a9f5316b2481a352385228ece53db84b143989978d264b20f61918bbb1ee0
font_01_sfnt_off000103cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CF 10620 bytes
SHA-256: d12ef410c631d7e222ff104d1d7ab31bc442b0982d02e6ed8753ff33ee7e72fd
font_02_sfnt_off00011c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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