Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f081f9dfb7ced4…

MALICIOUS

PDF

86.9 KB Created: 2021-07-02 01:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3771156572a13f32c28d3eb16484a558 SHA-1: b471b475a24eb2ce4c9f86624cd581655f9f9200 SHA-256: 33f081f9dfb7ced4d4ec5ad9a833829be7ffbdef3c71878698055572b3f3a56d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm or phishing lure. The presence of external URI indicators and compromised CMS upload links further supports the attack pattern of directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nomylo.ru/uplcv?utm_term=symptoms+of+glaucoma+in+eyes PDF link annotation
    • http://unityproductions.com/upload/files/17491266184.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/59653015291.pdfIn PDF document text
    • https://areicon.com/images/file/pudogorodixosotuwege.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/jpjbspuihhosp1m97senso89ku/94406028224.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e0a8553c2---dilobu.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e600823724---52168073904.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fd53c1655---tikabuxokalefakegemavaru.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/a3fe51910fc00b4aef40fad561be2c01/79782350117.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/sivuzi.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/90706877627.pdfIn PDF document text
    • https://soechi.com/userfiles/file/91207603043.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15b7fc1551---4773053091.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/supazakamopuwaran.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/2ad65be9bc4deb4483b2a75d24b7de45/65727850183.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2deeb0a5c---92114998360.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/79cc3534b3886a13f7341677b956d7e2/mizuwubewajeved.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/89886409612.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/48634593861.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d75bc64ca---12589665576.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/4503737763.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3543d0f21c959286ad5cb21b7ff27453/fenigizinizopu.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/wudetonazupe.pdfIn PDF document text
    • https://maturana.cl/upload/file/51922913545.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7e01c4e03a6e0986fc1a11fb7ff50424/27772468801.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF090 11012 bytes
SHA-256: f88439c066afc70472cb83453ae12fa3b985f35fab90c63a966d98b8e6b6d49e
font_01_sfnt_off00010a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A38 17016 bytes
SHA-256: 7c57167e34da1eb8e96b9016a31ca8bb3f393bc067b5e71b0365ab9fa5fe6f30
font_02_sfnt_off0001366a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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