Malicious PDF — malware analysis report

Static analysis result for SHA-256 e10f2da33fcb5680…

MALICIOUS

PDF

87.0 KB Created: 2021-09-06 10:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 30ba6d82fe3b883cb1aee15bb62ba5fb SHA-1: ee69eecbc59f974bec6a8385a6168f37c624fbe7 SHA-256: e10f2da33fcb5680e8f7be2ccd4e3f1143016a4d5806ccfd8c0d9cf64d33877c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised or disposable hosting sites, a common technique for distributing malware or conducting phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be a byproduct of the PDF generation tool rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ldoris.com/upfile/files/20210815131625.pdf In PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/5d99ec6228ee11f4dfeec0a13ab12715/lazenugomogomo.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/25782321341.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/69437585967.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/zumerut.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/77567860992.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/82224257636.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/6dd650acfd3683bd939f816b8814908b/9328682900.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/zedexetosivowapu.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/jumunuvifugotovebotob.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160811e96511e0---67078285615.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/wovigivolebegubisok.pdfIn PDF document text
    • http://www.polni.si/Images/files/20908140009.pdfIn PDF document text
    • http://clingac.com/d/files/86017623449.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160957873a74a9---norud.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/71993219609.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114f729c3b92---29859450479.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/9avsv7cgjtms5l8gm4s397e42e/33181687319.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/51156890904.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609417a2434da---bifobemelotelanumenexoxep.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613594cf5f791---warumaromewonedebutur.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/67724226010.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/64769613032.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/99870408061.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/42947935578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=inspirational+speeches+about+life+pdfPDF 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_off0000ed3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001054f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054F 18840 bytes
SHA-256: 52f1ab6f7b16b50930269d282f0c00ba82a5bfe27efd7d53f4076fa2dc87747f
font_02_sfnt_off000135ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AD 10908 bytes
SHA-256: fe6f13798c8a2cd06c6077b7f723158790dc31c2839fe13f64e0f7ef94ba9e6e

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