Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4fdb814440b5f4…

MALICIOUS

PDF

82.6 KB Created: 2021-08-24 16:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e84a308a4e230a1750bab3a63e1b9811 SHA-1: 17309c245a62eed076cccabd3dc04c551e22736f SHA-256: cd4fdb814440b5f49dbdac468d61c46d64f9dff4b3442769d97b7306a7f1d224
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://crysiq.ru/uplcv?utm_term=how+to+download+gta+san+andreas+in+pc+for+free+windows+10 PDF link annotation
    • http://www.patriarca-batiment.com/ressource/site-image/files/86265745576.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/bagawurebokuzekasizobu.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/2646199235.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/wugamepuruledep.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1d1a5a4ff---mibefosanifuloxo.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/56737542698.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/lujajinesesilivi.pdfIn PDF document text
    • https://congchung7.vn/upload/file/63767650719.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f74d2e4399---31832592550.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/73b8a1e451754ec78787508b84611673/kejopimenomujidekid.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/84012377198.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/6scdfk998l8ntpj4niapa4od87/25345468743.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a231949b0bb---55527827048.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/nitumeduvunudarunewen.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/pajukopevosonuloxe.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/15962761397.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160873b72afbde---jobinavofinederuv.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/54948377786.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce1c6bf9f2---34298818553.pdfIn PDF document text
    • https://keluargamimpi.com/contents//files/48052197322.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/kutebosubugukepedinixu.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/lapovirimepuwagafenuro.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a35f1a454a5---49203933789.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/mibefotakixenol.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/40050139983.pdfIn PDF document text
    • 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_off0000dd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9A 17156 bytes
SHA-256: c6fdbe5ae36153063ca7b036d25763dbaefa0cf3934482fcf2d8cbb896d82f22
font_01_sfnt_off000109c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C2 11048 bytes
SHA-256: b7a2d4ea680974a5d81d1888daa9024a01438b010bddcf731415e39e00da4a91
font_02_sfnt_off00012372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12372 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1