Malicious PDF — malware analysis report

Static analysis result for SHA-256 05728a6c828f1285…

MALICIOUS

PDF

92.4 KB Created: 2021-09-01 16:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 764323e11c10e632e64a84f06e766970 SHA-1: 33a6dd83820a2106747148a0b131c8a1c4e1116b SHA-256: 05728a6c828f1285f69565c31dc4a37076fb9aad5b17e56fe275de818c60ce4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://secolink.sk/userfiles/file/rejeguvawifow.pdf In PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/89872802151.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/24893429188.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/mefazejapuba.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/9266065458.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/97732666825.pdfIn PDF document text
    • https://horticulturenepal.org/userfiles/file/ropefubobobibuforuwu.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/75fte9lg2ebno58sc6s3qqn6l5/zojopewudonibikazi.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608224f96a77c---wipasemivuvenov.pdfIn PDF document text
    • http://gtshotel.it/images/file/soviposubofitatede.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/satuwapumagovotef.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/82493454560.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/5e30ebc0e8dcb5807e0a9bd7fc2d987c/dunafi.pdfIn PDF document text
    • https://greenways.at/userfiles/file/46392833935.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/32100608845.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c06b5d570d0---313159095.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/15242416033.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/a05b4234060239622f23be161b7ca1f4/kilugalabufaliketan.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/8b0741ad7935bd7f7b75f49fad9462c4/28166893005.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/69722042867.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/890185c51b41303d30ad8949f7884be2/valas.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/papunorewuxekajupuripanev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=cat+protection+spellPDF 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_off00010710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10710 17104 bytes
SHA-256: f0d105b55b8fea7c19b2a26cb7fb4eaf50e87fb491a52f8e4dae3c05b395a8c7
font_01_sfnt_off00013387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B9E 10400 bytes
SHA-256: 672913306edbcd168dd50a1156269b2332c1860766b0ee3759fe19274b2cdb77

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