Malicious PDF — malware analysis report

Static analysis result for SHA-256 93396c80ab43a036…

MALICIOUS

PDF

81.0 KB Created: 2021-08-28 19:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d023d06e632a35ad6ed706d8bdd8f1cc SHA-1: 442812637aedd4141f7d1245afa22738c0778afc SHA-256: 93396c80ab43a036f4d8ab9c1d21140319e7e88cf6dc7eed443e97702176e661
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to various domains, many of which appear to be compromised CMS uploads. This suggests the PDF is designed to redirect users to potentially malicious websites, likely for phishing or malware delivery, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://philabc.ru/uplcv?utm_term=ausable+brewing+company PDF link annotation
    • http://wintec-samu.hu/uploads/files/vuwowidip.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/tc2m5qh57j6j0lg89p0bfmfeih/sojuxi.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/gikolu.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210811_8760D3244258B80F.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/58462568039.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161255395de02e---sazokozokuwirewigaku.pdfIn PDF document text
    • http://regmac.net/userfiles/files/mukupikulafadopigo.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/96077774055.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16109e684ccafc---75700107323.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/sotugibixenimojavomig.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fe967582c96---rogufip.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980ff52f22e---56576455748.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed385cca9c---sizesezozinevibikevugi.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/5152214154.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/6c780f366838394f6b116e48b0d81bda/genexegutenezulasivadokon.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093afd308157---99876768988.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-20/20210520140218163697.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/tugenafimovejosevuxuzol.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/6a57ef4b664e588fb62169656d01cf91/wofipitej.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1610a536673e6a---82089743793.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/37878054758.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/kivojutorerexapew.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/mokibijezivepuvitiduse.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160abb5de74e47---46680656425.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_off0000d76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76A 11040 bytes
SHA-256: 7b18f0440ab84e6212733623a56a08f33ade12e655ae072019f58ae0faf91b56
font_01_sfnt_off0000f0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EE 17248 bytes
SHA-256: f87d02c03cc9ae4efd691a5f737e7edaf11b4db31a39e17095ce415864b1467d
font_02_sfnt_off00011d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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