Malicious PDF — malware analysis report

Static analysis result for SHA-256 50350af9a15ff762…

MALICIOUS

PDF

86.8 KB Created: 2021-09-01 14:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d924a2e1c0003eee2c1f36eedd0d9986 SHA-1: bca4684f6d35b7c970f0145018743944c53e8773 SHA-256: 50350af9a15ff7620ec2aae65a4518a6fb5ad6f1e67996a620156fb96e995c54
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, pointing to compromised CMS uploads and disposable hosting, likely to distribute phishing or malware. Although no scripts were extracted, the presence of invoice-related language and numerous external links indicates a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf545d0341---nimiraxuradefovora.pdf In PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/433fb13bf439e3567803e33aac2b5524/sigumivarugopesumoxav.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/75361a539d4dd4ec163b1f80a73beca2/poriramaxufulux.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/16660664111.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/21180380148.pdfIn PDF document text
    • https://eguiders.com/uploads/84933248791.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/miletubuzonowonisasaf.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/fec2cce7c28d885dbe279b03b061a73a/30331032265.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021070502454473499.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/67606401464.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087495e2df85---25442502274.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__611E38C7C5845.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e336f226202---80917913469.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/padolewebabonunebuganilil.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ef93edad---39466551475.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/oujd8okgn4ef45muqt0v76j3l2/30058613920.pdfIn PDF document text
    • https://clinic4lab.com/upload/ckfinder_temp/files/20210701054526.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1612b49ba70c2c---pekarefis.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f9d9652f664bf0f114a5e67677ff2caa/27746750206.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105ab31bb4da---jojelokoxiwupulijosaf.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/12114216833.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/72258865310.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/vumanudutukirebokodu.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608091e51cf54---fuvemedanenul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=second+hand+mobile+sale+letter+formatPDF 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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10826 10956 bytes
SHA-256: 8afb8f926db20c7e6053f9b789261016d69ff645edca03f11b9a96b6794c4447
font_02_sfnt_off0001214f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214F 17204 bytes
SHA-256: f273e825ea080d37a4203c336e1344acdf0e5191b91cfe82f371076dc5641fa6

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