Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66bc79e256baf2d…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 16:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c31aa0450d2d4488f1a22aa69ee2d726 SHA-1: 3d62b09f6f2c2784872b1955817e3f3dd4fe4312 SHA-256: e66bc79e256baf2d81e14bf0c5f542707d728199ea2cc4c97ccc873420b2064e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised CMS upload locations and disposable hosting, indicating an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting it is designed to conceal its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e62f53477d---91100600692.pdf In PDF document text
    • http://integrotech.eu/zdjecia/file/47356076695.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/20171257250.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/63679680798.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/50958971333.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f33e8e8079---xudasazadulosimibuzabi.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/47861ehv8ictfap97g8feef6u1/64008024755.pdfIn PDF document text
    • http://livestocktool.com/d/files/88586865328.pdfIn PDF document text
    • http://zzquansu.cn/d/files/kojamote.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/jawudutulez.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/nerasusin.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/pixiregerujizaf.pdfIn PDF document text
    • http://standardamulet.com/files/files/xudixirulaxut.pdfIn PDF document text
    • http://gamulchi.org/userfiles/file/finuzezivofuz.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/3e5ae012e2cab92735400c2d77d1db4c/tasopofukuvitakabulifo.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/43209097629.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/xeputoj.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161467ed9c8be3---vipaxizimosutowofe.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/gerulojumasujujipifugo.pdfIn PDF document text
    • https://supremeroi.com/FCKeditor/file/tones.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/dufebavuxetotubub.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/63854671725.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edec8b4f04---japiwulorinidip.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/nesumiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=who+see+my+profilePDF 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_off0000b1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DE 10368 bytes
SHA-256: 975afa8299deb65e7a7eadd54bdff2e86c4e03055d90c647443960d7337798d4
font_02_sfnt_off0000e145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE145 16908 bytes
SHA-256: cdbac452ada3e0352ffb35c236b99af619e3c5d349ccd3ecc5a4b5017b50eec1

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