Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ee151f25d554976…

MALICIOUS

PDF

74.6 KB Created: 2021-06-26 20:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 710d9d43824f13bc5297544e5ad03611 SHA-1: 6cf09988615edf8515bc89c14fee12212aece13b SHA-256: 6ee151f25d554976de8584a5df49de732f14686f9142160e88addbc86de919e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://wastran.ru/uplcv?utm_term=sets+and+subsets+of+rational+numbers PDF link annotation
    • http://rencontres-icare.org/userfiles/file/76300653661.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/33cf942ec9753248dddfdaf8bd02a996/jutuxapokujipol.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/55863283103.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875973dafd8---fividujojotigejigigutowu.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34181a2513---fejevotazaw.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/40009280290.pdfIn PDF document text
    • http://yfatc.com/userfiles/file/nirapotarado.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/jadibamur.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/sesaseladowalobudodixuki.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/zolerusazasataxox.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/zebebojoxiteres.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/7382ed460cb4f31340c75476ecc70b9a/54504759892.pdfIn PDF document text
    • http://brlairport.com/images/file/37658324302.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/mlkg2tfmik43stok44u4luqfm3/zerewirekazadex.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeac021def---54273406526.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160967afba2d7f---safowidupiborobirisefa.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/34783673532.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c8a2b672b---pijabivudunexikugix.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/45127715746.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/desoz.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098b7b61b6a2---pozolir.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/a630947c5abf65acb5c9517d9290dfe9/52705716391.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/5ccf2f1e46a278e2faa7cd537b7b14d7/923331787.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_off0000bf53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF53 16564 bytes
SHA-256: bff2a812d55577e5a8c6244fb1fef3083b8895349b5c609b0a2c15c94eaaaf81
font_01_sfnt_off0000ea94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA94 10828 bytes
SHA-256: b36004fad6dd2e34b64bd2204c693f595f629fbd0699664aae19747566e92e5c
font_02_sfnt_off00010380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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