Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4644815881cc0d4…

MALICIOUS

PDF

131.3 KB Created: 2021-07-03 08:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7a9fbd4762b56f7f8b64befbb1ac7f90 SHA-1: 5432acb0f1fa9c3ec523c4c4505911a19f4c18cc SHA-256: f4644815881cc0d4fe2f29dd52697250e30d976b2c469e843513202b35ea2a00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly suggests malicious intent, likely to lure users to phishing sites or download further malware. The file's structure as a link farm, combined with the external URI heuristic, indicates a primary function of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8961

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://irlanc.ru/uplcv?utm_term=soul+eater+crona+weapon PDF link annotation
    • https://stillwaiting.org/userfiles/file/33940325064.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160790ef5e5e2a---dovomixe.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/9q48tnscpu80g15o1j6s89glv3/baroj.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/e69b426aa3cbd66d78abc264b3c6c3a6/xukawo.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/0601bf1e5dc15d5f2e09eab331636175/51862123999.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/52719a2ee7a2049a536ec25702f47853/ronixulivosemubat.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607237e3c5945---25273847103.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/gofikafotaledaf.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/94129621495.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f46a7c594a---nenodoxekateta.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/20956620203.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/dozadejarigonesakedoje.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/7i53s2a8p44l0rmk2b8e7vc9g0/zogaxuxusakinanugalalagor.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/63168642086.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/3d8d8bac7111c6985b729bd2ff70c492/93772487350.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a08694a8a09---pifejilojididizozesejiw.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/99115338544.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/36836152794.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/f9c7b726b177a0ea91de1bb570f723ad/23751782067.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/merajovozejon.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/jiwegiboz.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c6d8962a6---zavosaledenulere.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7bc506424---xigasenexiduvigevo.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/57995989228.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/e848bd9d3b249c63388bb5864b472b17/ruvemufikeperazafudazetu.pdfIn PDF document text
    • http://infunplastic.com/d/files/54180978047.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000160df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160DF 12940 bytes
SHA-256: 254e51e63be3e823e8af4ecc41624cf3df25955174676cc682db868b895f7bc9
font_01_sfnt_off00018a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A19 10368 bytes
SHA-256: 7038f3ab68450c4202be29085ad6a37f1e27fed0b3c74c9f17e9b4d26aff60e5
font_02_sfnt_off0001a1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001b9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9D8 18364 bytes
SHA-256: 94b4794c7c9f115e146612176a879678884c9f454e7103b4b958e37c19b3101c
font_04_sfnt_off0001e957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E957 16132 bytes
SHA-256: eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8

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