Malicious PDF — malware analysis report

Static analysis result for SHA-256 546916682f52092f…

MALICIOUS

PDF

73.5 KB Created: 2021-09-01 17:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 8fedc87f1716249abd2718419a1a1ebf SHA-1: 1d2e0b338e53090a6a3406010bd734d58a182728 SHA-256: 546916682f52092f0f34ad96618871d4e1b2a149c169a200f03aebef092c98e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47dc438d11---11977360625.pdf In PDF document text
    • http://gruppocaminiti.it/userfiles/files/36170234137.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/subofubusudetajesi.pdfIn PDF document text
    • http://www.moyekolodin.com/files/98991573776.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/a1481b94c47a7fced77046088d92b18b/2854250478.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/70267096722.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160952caf1392b---gezigovad.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bd98f2c24---kupifimitotafi.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/i75df7rf6r8ipg6rhb2tfdls47/favamodebigiwivudamaji.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/77272e04f92e6913fa2fec77ee510fa9/21916578949.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/ktjattqffjvtfl5e4ss9qlod34/50232951798.pdfIn PDF document text
    • http://josquin-capella.de/download/momomozununowinum.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/32489291007.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210511040023701314hfz72a.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608243473c154---22644137348.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1621188200.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/nuwemeluba.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085a5ea27f48---7186849176.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/45215087005.pdfIn PDF document text
    • http://ssp.by/var/upload/51929660563.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/c1409829470d0bb0a626aaf26434d8bf/34243229056.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/6867b45e1e8b6b895877c6ee238520ff/gixipozopufiwazubopuri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=answers+7+little+wordsPDF 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_off0000bfe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE5 16100 bytes
SHA-256: caadc62e1b12b2b0b7d5819e2b5bf0d2eae396d7b1435a43f39a9fff249d9ef3
font_01_sfnt_off0000e8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E6 10196 bytes
SHA-256: 82e3919f6fc74dcd00ee00b7dce9ba5a7ac014c44f6846e6a1a031ceb9df17e4
font_02_sfnt_off0000fffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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