Malicious PDF — malware analysis report

Static analysis result for SHA-256 7613245edcc9e440…

MALICIOUS

PDF

89.8 KB Created: 2021-09-07 16:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b4c2fbdfbf75fa6b3ed71ab18de7ffc SHA-1: 70c03698976485be8fea7dba191592679a98273d SHA-256: 7613245edcc9e440d744f1deeea854da3ad43c7af3ff043d15c9b1f88b44aa0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://zebcom.in/userfiles/file/40658489155.pdf In PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/rvkgma6dl77i4jqk9juq6dpmhv/weninodemitosadogegoxuza.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/b20df638d117e60f3eae3b80e24ec686/nezogakunebure.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1ec68ede---rawubiru.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/7b17f1b617dccf241d9568ad4179159e/37648015950.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/novatomumapuvusuzetilamoz.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/4lt5if18uq85ssplk4u8u1meef/11655102790.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/79194852801.pdfIn PDF document text
    • http://aven.su/userfiles/file/63391966384.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16129433980ba5---89982638629.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e739086292---28477777619.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/39443312634.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/f5341d7e2cf0d62798f67fc25deccb67/75648293862.pdfIn PDF document text
    • http://ruihuitax.com/files/file/voxakixitewini.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/215c3e32aea5d92aae457339e1120de7/pudevevinozibolaw.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/pagejarexinuzirukukokup.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608759fb4be7b---nuvomesukajozakadomevor.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b3cf75998---22879217857.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///21930366904.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/bixutawarowifididud.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/17766691800.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06bb796306---75910687216.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96617bb2c---buzivitoxujon.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/berasarigolalonivoja.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/guropojogexanavi.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/86183243894.pdfIn PDF document text
    • http://parquessolaresdenavarra.com/userfiles/files/bogejesusaboxa.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/kixifinepilup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=les+prol%C3%A9gom%C3%A8nes+d%27ibn+khaldoun+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_off0000ec8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001049c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049C 22356 bytes
SHA-256: b3fd9ad2c6bd6a973e6e6618f4f499279b3d4c228687736fe926db7c94407ca6
font_02_sfnt_off00013ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE8 11480 bytes
SHA-256: df409064a58e03a34fbecd311c359439ab5ec79e21e87a94a1e9f0ae9271868e