Malicious PDF — malware analysis report

Static analysis result for SHA-256 df06f887656c1582…

MALICIOUS

PDF

80.8 KB Created: 2021-07-02 22:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1f0284762c73923fdf324daf7150e056 SHA-1: 2240509a8a9a98ccc957263814f5decb48c7090d SHA-256: df06f887656c15822fb88e8da827cc068df7be8e848b655c63549ce0d86d3f64
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and disposable hosting. These links likely serve to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d8a02f7db78---56296922360.pdf In PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba41f88cea4---dijakavixenusaxosaxisemil.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/xidezutunezofufobof.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/e21d0b620254aeea9e13fde595e10ed5/79705154984.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ch5p7jvmn9h44aftkqgk3n48t1/gebibinuxif.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099a759a909f---18884535022.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/6rrssuac1t4trgrdmc3t8nu8q7/81562668719.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/faruwewumumuxategew.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/84019007096.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/revutuzifubo.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bf34886c6---45607739297.pdfIn PDF document text
    • http://mcutech.net/upload/2021/06/file/1624533365601397908.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/nejegibegaz.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/duxerodopuza.pdfIn PDF document text
    • http://jucal.es/images/file/fopimilazagugelezo.pdfIn PDF document text
    • http://belst.by/upload/file/53686623156.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13f25ddf73---lekidewopuneligigodagoge.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/u723lomrp61iemgk2m1o9327f0/30254048201.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/51119617590.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/gaputuk.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606cecea0174d---vigezinomejomirimafe.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/56356977189.pdfIn PDF document text
    • http://merwepizza.com/upload/file/xibonejitixuwekojan.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dfbfdfad0---zatanus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=best+buy+test+answersPDF 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_off0000d98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98A 17156 bytes
SHA-256: b60cd7dcaf1a48f6293c4a8f6f567d793bd7093f62e7cfa5827822d9c315be5e
font_01_sfnt_off0001065d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065D 10336 bytes
SHA-256: bb452ce27f97c5c19e617604a9c21bc952b8d782801f2ce97ab586417e7e3ad4
font_02_sfnt_off00011dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1