Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4856fce70495cae…

MALICIOUS

PDF

85.9 KB Created: 2021-06-28 12:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c455ff4cbd6401f328993fb44285a21b SHA-1: de8501a9979fddc15e75e0c11c8dd8dd10ab394f SHA-256: b4856fce70495cae61a86b2d90b21827ed6d6d636de62c9728d360e92f406290
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to various domains, including one that appears to be a compromised WordPress upload storage, suggesting an attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ggmtc.net/userfiles/files/1883998363.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/muzorufom.pdfIn PDF document text
    • https://andrejc.si/files/file/sotubusinewovozisoweki.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/de19fe6a09c2858382c44548a578ba9c/xagofusalivodarofem.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7a32eb8ad---14221766922.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/72015937753.pdfIn PDF document text
    • https://sharenkon.com/files/kelepitol.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/sobal.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/3e044c949aa0c30f8d5c4ab693db88bc/90865085874.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080936434f48---rafirorunekabutikusa.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160817fb59993d---65742782368.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608683e78fd0e---bukukarikubowalawawa.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/vuwutozoguxalilixewi.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc610e0fab1---29141451422.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/cf516d561fe6745c93e0f2f5c091a926/43157820363.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2c4a2b3e---kikebuj.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f108d282ad---53458048636.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf0888d957---65770850233.pdfIn PDF document text
    • http://meta-min.com/files/lawukoxifabaruxogawikifor.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ca9cc4e53d2---fitotatof.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/rikof.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/56210550602.pdfIn PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/14532021942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+last+day+on+earth+survival+pcPDF 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_off0000e7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E7 10852 bytes
SHA-256: b759751138a69863002f2924f256cff8ca2cce2c155f7a8642cf3ac97e4bf21e
font_01_sfnt_off000100f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F8 18588 bytes
SHA-256: 7d08fe7a5614bfb3f3ce204ed9a6a7488b002b474c6d85b0b159df879f15b479
font_02_sfnt_off000130a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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