Malicious PDF — malware analysis report

Static analysis result for SHA-256 1931332e991aee5e…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 12:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd41c2cfdc61d4c050316dc692ac126e SHA-1: a7e661fbb3918b5dce11e745cd0d90a562eb6d98 SHA-256: 1931332e991aee5e2566699b48fb860e627c2ee4eedd8bf9f007be3f7dca2729
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a vehicle for the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=blackjack+font+for+android PDF link annotation
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/9e7f2b0baffbb7ec4a322c0b890dedfe/46053929852.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/52183713852.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/51915090549.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/8154115281.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/23010661366.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/53082377065.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/pebesusokukidaredinu.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/465821f7c9d43f58bf4950e193d4fbca/99634315595.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/gulibamirubev.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/lububusabevirofikopelab.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109041122555578.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/gazadowu.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/zosesaxonuwesufijixu.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/fosenobojeperudufinodutu.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/fexamekemibuwejur.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/mebajexebuginomik.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/xunok.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/gapugowijidabuxipikap.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/gjops9f84eq98dbrum3iqgoks0/32359921760.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/goxalibexizejesibebor.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/u29r0legrum2udpg4j41p26oj2/88397680637.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/salomepoxiwewebo.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109061550565986.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_off0000ddca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCA 18032 bytes
SHA-256: b82babb793d26b04ad5047b19e696e6b14781bca59a4f10337971557d6172c2a
font_01_sfnt_off00010c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C59 10444 bytes
SHA-256: 06fc87757ca3d326cc6d7a56ea386d7a25d10a1ea7831a88d3c4fb56184b4a9d
font_02_sfnt_off00012425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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