Malicious PDF — malware analysis report

Static analysis result for SHA-256 15498860c8025fca…

MALICIOUS

PDF

92.9 KB Created: 2021-07-05 05:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a9df705e202f39110aa35ea32020fb18 SHA-1: 25ef91c1bef733e381d049ca55ec1607a488ea3c SHA-256: 15498860c8025fca0f20f6bc00d19582a94292fb6d462d9dce491810f4952c92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's part of a phishing or malware distribution campaign, likely delivered via spearphishing.

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 https://oniceh.ru/uplcv?utm_term=b+flat+major+scale+piano+finger+position PDF link annotation
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf80ac63f7---dumozenotubamutapozo.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/dasilik.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/24687335084.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/1612c0e7bbfb299a55da6642d5d88691/96016130366.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607621cd39c04---runitakaxenusijejes.pdfIn PDF document text
    • http://sns.hu/_user/file/3148038340.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160804cefd2494---gamunuzawoso.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/1eu8it7lucol0gkte9d5c18u77/5209944491.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/jufilizebikokaxelolep.pdfIn PDF document text
    • https://businesslife.com/content/file/60225283578.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/32267225017.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/batoviboju.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/e3a7368c1759d8bd0158e2fa1991192e/83436156418.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/h437rfpce3g5dut0lp0rflbi0v/miporosemeg.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/gexixotalurexezeve.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9552561e0d---pulabavejiropujaduju.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746169256ef---gobironopilezivez.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/mokevadozipenaka.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/c3b098372a766b6adf198dafececd7bf/bofefunixujitej.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/6eb82135d6f1ca003931abe3206925ac/divinek.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf139ef16b8---soledakatenepexixifawor.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000148c7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x148C7 18076 bytes
SHA-256: 12ddd80483d7ab8a1d511ee7eafe684263ce6ea706e57d75216a5b3b9d4a9db6
font_00_sfnt_off0000e829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE829 11008 bytes
SHA-256: e935bda4da8b062ec003498b6fd2810f1e1a95a9adb4b92fa31b736c32b46e0d
font_01_sfnt_off000101b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B8 18032 bytes
SHA-256: 4b1b2c32c889a524f43e2d750667eaa99421fd431b044d0d8b20388206bf037a
font_02_sfnt_off000130b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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