Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f61460be3fcb609…

MALICIOUS

PDF

98.0 KB Created: 2021-08-01 13:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c16a3d9fbc6a1eb11d4a7d30eb41db6f SHA-1: d840c54a3af35145da3c9e874009d5adc557d839 SHA-256: 1f61460be3fcb60988cc1763389f441eb7839a3118ef4abcd7e49d79765176d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

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 http://fotografoenricogiampieri.it/userfiles/files/gudikafafukikejuke.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b228af2cb3f---sevupigoxilenujuxogi.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e22057483---62779360749.pdf
    • https://organicfertilizerproduction.com/d/files/63451079770.pdf
    • https://zivotzaokny.eu/res/file/54284650469.pdf
    • https://feniks9.ru/ckfinder/userfiles/files/pufibebaludane.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bab9ee3d1---34279952057.pdf
    • https://mvpartners.be/images/uploadedimages/file/90379357642.pdf
    • https://yepsell.com/userfiles/files/70662001892.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608244483e046---navutevosudere.pdf
    • https://caribemed.com/userfiles/file/26559091711.pdf
    • http://sequirk.ie/userfiles/file/81066743188.pdf
    • http://dolinakrzeptowa.pl/public/upload/ckfinder//userfiles/files/fumavekem.pdf
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/vevexuf.pdf
    • http://duda-tech.pl/dudatech/upload/file/5713740992.pdf
    • http://baldonimarcostudio.eu/userfiles/files/bapiwu.pdf
    • https://aduanaldelvalle.com/userfiles/file/17992660146.pdf
    • https://dienlanhhonganh.com/images/pic/file/nivepijulifojakinolit.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/20ac5a71d3abebbaf613ee68de805bf8/26464144438.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/d795ad7efb14df45922b0a8e3e792807/fovaxemafijitefibifoxozo.pdf
    • https://ikitellirezistans.com/upload/files/dukiwemuvibuteziwed.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f8af7f0b40d---10468047511.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-5/20210505203452150197.pdf
    • http://washchienluoc.com/upload/file/24964703473.pdf
    • https://ohcsi.com/ckfinder/userfiles/files/91293733970.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/3kuhrqctdr8s2hrskcsl0pk9ig/jibeginapizixejarev.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=10+oraciones+con+conectores+de+comparacion
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001006f.bin
131df1b37119b5860baf4f5a74c4fa96e02e3654ad6b754f554ed261804fbb17
pdf-font-stream PDF embedded font (sfnt) at offset 0x1006F 10708 bytes
font_01_sfnt_off000118f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118F9 16792 bytes
font_02_sfnt_off0001310a.bin
00f8a0ddc60f6c586bbbe56d90d65b395e12218d33cc5a9e644d1f15acda2ffb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1310A 17036 bytes
font_03_sfnt_off000149ac.bin
dd48f5ec3a289729c1d6de6a387bb38c516b7c4324d785ba344e8b368ab8cfc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x149AC 18044 bytes