Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f6aa6d397a4a36…

MALICIOUS

PDF

84.5 KB Created: 2021-09-02 19:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1bff73602b0534339201dba9a05ee4df SHA-1: 45620cc98ce391244f7c7cf2a3b4fca701c454e4 SHA-256: 08f6aa6d397a4a3625f24259d562dcafc6f4ab68495721782db34c24a1b4ab3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://accuratesearch.com/userfiles/file/53978916375.pdf In PDF document text
    • http://hebertfamilyreunion.com/clients/3/32/3272330ca4c68e8b1120eb7f178c7a05/File/misaminazoba.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/22254284607.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/zowiworebi.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/mutufogamirelan.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/43159629111.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/kosub.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/61621014798.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/jizedugelotajitaju.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/tisin.pdfIn PDF document text
    • https://securityguardsupply.net/php/uploads/file/pasifusesoximajafo.pdfIn PDF document text
    • https://promise-land.com/upload/file/risume.pdfIn PDF document text
    • http://sun-eko.eu/files/file/jipim.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/v8tq1r4rmk4so872d1a58aokg7/gewamurisososiga.pdfIn PDF document text
    • http://ibb-online.ru/f/file/febora.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095fe51e290b---30446549490.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/xevivuxepasora.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/794103b2869e7c17429ee1acb3c7cbdd/30327312483.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/jepifetal.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f3ab1b144---negamez.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/89uf7g93f1qfmnu9po2mtdhgn1/samiwetif.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/xezofozalaxox.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a5dbd789f6d039727c48d055517058a2/vaporezavovedoxixo.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/qqliarsoan2g1j60j5nod67fm6/92816521641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=top+notch+fundamentals+second+edition+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EB 10848 bytes
SHA-256: 64bc9aeb423d781da502427f9bc94a270de783c2e51ecdabd7d38c42fd5ecb14
font_01_sfnt_off0000e2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADA 18080 bytes
SHA-256: fd437c258fd1212ef3286cefb73a9d586750502980558d39841c8d26217067bd
font_03_sfnt_off000129d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D5 16836 bytes
SHA-256: 645820c595d4038498db028c8b5d80835908cfe6b43d33359db03e6d05944cee

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