Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fed370c36c05faa…

MALICIOUS

PDF

81.4 KB Created: 2021-09-23 16:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8b164a433a8e2747b7c9bbdf4316acee SHA-1: f77255efb91bd3c3359cbba411c699426b95d476 SHA-256: 5fed370c36c05faa352f38045ee3beb1c198235e2b4ee3d075c6c8632bc85193
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is a link farm on disposable hosting, likely intended to redirect users to malicious content. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/2b5e46ac68fbfb02627d94d9e8f632e0/matemazawoxadolasazojez.pdf In PDF document text
    • http://inarchengineering.it/userfiles/files/tagupe.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/onjir0jtvu2ob85mft4ru1v4ko/jireboputefikupu.pdfIn PDF document text
    • http://hexindechem.com/upload/files/xipoxopaledefozakatufu.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/vezudibipazena.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/70539275634.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/blplflntkl0a6uf1b71h78i7v0/rogusizugufifexonu.pdfIn PDF document text
    • http://biosite.ru/images/news/file/39633907590.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/jekapuwekivilak.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/39207219618.pdfPDF link annotation
    • https://beamstraffic.com/amb/userfiles/file/80424338177.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/mixubow.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/sudedexedomix.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/juzapisiwa.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130acdab6021---21588298514.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d84dd9f22ea969e516dbad13f883e322/27352171103.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210910043044.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/lebasovavofuwulazogugumaw.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/69220241408.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/xunisuberunopisegiba.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/7924636093.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/lekatalolanoxenulomilub.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/91065211346.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/rodaterolopaga.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d49517a2ce288c67bf4b0147aec71358/61203363718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=friends+season+1+for+freePDF 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_off0000da24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA24 18176 bytes
SHA-256: f52c4b5953dde07b9633fa7695a423a216c06dca45b67d20f19f8753c38672fb
font_01_sfnt_off0001093c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093C 10232 bytes
SHA-256: 95ace838b945581c3c640ea1afb4135c33aae437b96102b4f409b7cebb4bb948
font_02_sfnt_off00012051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12051 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1