Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d31fe2a261a19fb…

MALICIOUS

PDF

83.3 KB Created: 2021-09-05 02:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f8de88de2cb42138c6f39fb3ed697ac2 SHA-1: 82015675bd209ea8072e0efe0a715e89392bfd55 SHA-256: 1d31fe2a261a19fbe0ed4cd49ac20edb60b8a82fc10f240ee53a0c12097a1ddd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160878ad41e165---79680224079.pdf In PDF document text
    • http://2ds-creations.fr/userfiles/file/6698478889.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/vilikemepigosarixotetitet.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/jevagilusapexobave.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/zolanakavek.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/16735703126.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210628033544_276cpa.pdfIn PDF document text
    • https://wecareprogram.org/images/file/58051985489.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610256bb31ee9---bunamubejugakerereb.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/98809543291.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/zenutuxomezixado.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1bf82c65c385dd08b0ea8ddb005d8c28/45845159547.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/19155656967.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/32422205776.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/fovupoputoto.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a36a9319423---48261940060.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161151d6835e2b---gapujatoge.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c533cee63f0---56549906231.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/87884594385.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c8545bd63---2685802746.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/golakudedugo.pdfIn PDF document text
    • http://citra.cl/userfiles/file/revobezaj.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/29069c2ea1eab42752efeade64717bc3/vukeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=inclined+plane+physics+problems+with+answers+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_off0000db3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3B 11176 bytes
SHA-256: b0a334dfa207adc696e30e4b66acc454c7a6937f47b9643e5eb56fb0abb8399c
font_01_sfnt_off0000f4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FC 19104 bytes
SHA-256: 4bcd518c91d39286263bcde8c945c1d907a1e745229e00687953b95944875dcc
font_02_sfnt_off000126b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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