Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5b8173926897ae…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 14:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e0241125fe193939cec7eed66c4a3a71 SHA-1: 4292d806c78d0e3f03011d357d27009dbf3be03f SHA-256: 1a5b8173926897ae35e1b70490a0e03dc2511d19401de7f031e304dd6eeb29c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure of the PDF and the nature of the URLs point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/cbee75b6696720eae7c29a311ae021a7/30895360953.pdf In PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/d083suile074o42jlmc7muqr47/78794375136.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609860e8eab2d---vutuneb.pdfIn PDF document text
    • http://bronia.org/userfiles/file/luxutelidabowirurol.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/virujosetuzure.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/geluxudifapev.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/24af25bc8faf604e660fb5e880b58c05/bulupegusenotibodudisa.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/33b07948b4e4a9712fbb34cb176c68d0/65419162463.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd7190897b---wasetonefizewurimemi.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/08959a2c22658c0db4deb2675d6cfb73/tofinesipewuzudotiped.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/26595570668.pdfIn PDF document text
    • http://health-bridge.in/upload/file/9960868503.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/24759211815.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d0293b3e---kabogeli.pdfIn PDF document text
    • http://zjlytl.com/images/upload/File/rezalugareno.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6909a18f1d---nogoxisu.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f76d6d1020d42402a55210f6c6c37134/70384117990.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/8b418c6a8ba30c76e4397f663bf5d5d9/pixusigazixexesub.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/10692203241.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/xazumejagokawobojuvuxavox.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/lmt7tc7q5fffelrc34ud0havpj/kugubinulax.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/xalijebelixiruwesafo.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8cf255625---naxebigojumerovexibovorer.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/64162387472289e29fc94b7384fff0d7/73461912993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=analysing+advertisements+worksheetPDF 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_off0000ddf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF3 11036 bytes
SHA-256: d608a5700fbcfbb35a89a82406ee5b2a9ac6851e677f702dbfa9821306633984
font_01_sfnt_off0000f758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF758 17692 bytes
SHA-256: 0f622d505467360c8f617b7163957abced8d3c73dc25f62943442a4ceb94f8f9
font_02_sfnt_off0001251c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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