Malicious PDF — malware analysis report

Static analysis result for SHA-256 401ee67e3907c5df…

MALICIOUS

PDF

86.4 KB Created: 2021-06-25 23:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1957266bda6f0523e3ae4e7470f096f6 SHA-1: 0a762fc456a1b685738728a1fee14d3ad21d60ce SHA-256: 401ee67e3907c5dff51d1eb04c245e79a7ee194faef9a17eb90b7ad8f7a6f7c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised CMS uploads, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 https://drafthe.ru/uplcv?utm_term=romeo+and+juliet+death+scene+drawing
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b826655489---vudefaxefidetuxopu.pdf
    • https://anukulagrotech.com/ci/userfiles/files/19347500399.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3d9f1ae1039724e7a2dce662fedcda2/40428017480.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/h51h3l7bhip8m58j797cafapo1/gefanirixubosidegumitozo.pdf
    • http://naturallabs.fr/userfiles/file/67179703655.pdf
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/33776472524.pdf
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/nagidijuke.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b63c0a20c04---89105706339.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6881287f3---89830987188.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/fabtg8k7472mv2g4jq1kl02tus/wozawijirisin.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/12eda25a69fd7ac8122b89088c33f14e/nuped.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/aeveggvogkiqje4f1orbhlov4p/16846177601.pdf
    • https://al-farh-iq.com/upload/userfiles/file/fuvomoseporubadevezab.pdf
    • http://alfonsoguiggiarchitetto.it/userfiles/files/lorulakibuxaz.pdf
    • http://kath-kiga-bw.de/bilder/berichte/file/kipifusovovi.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/6b46e7972a0999ac9a2f69f40165bbb8/wodozirudogutoniw.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6566ab729---wagobokojexenilepaxozenox.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/47699042769b91c21113ebbf5b1543b3/18338872804.pdf
    • http://chi-kara.net/userfiles/file/dinapapudutabivevex.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/079fbd9040f5e741dfdff1501fa90a83/52738992248.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d9b68f17d---wigaba.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0218f056a---88826820564.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/bbdce9aa9736a69a608766bfbfa03216/wugaboj.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df24b4dd25---55521356101.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb06f95f58---55841185469.pdf
    • https://spark-care.com/userfiles/file/finimasep.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb4.bin
f722891039c892afbf1efe1aac787166061879a375dafb0a6f6b228f838a0b17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB4 11180 bytes
font_01_sfnt_off00010972.bin
667a7e83a407254d4f0d6911d76f5cf616bdff8268916db10744b9aa52cb4dce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10972 16744 bytes
font_02_sfnt_off000134ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134FF 16792 bytes

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