Malicious PDF — malware analysis report

Static analysis result for SHA-256 9817df07b9229e41…

MALICIOUS

PDF

87.6 KB Created: 2021-09-04 00:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ef6e521746d2c96f35f32f59d36c2223 SHA-1: c4487a494337f7a2fa072d9b267a7bdde63c9c29 SHA-256: 9817df07b9229e41c42249cdd9c63fb9d053bd86700aa3ccf5390ff8de01fd91
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a distribution mechanism for further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=approaches+to+strategic+decision+making+in+strategic+management+pdf PDF link annotation
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/i59cclm1kvkbensgnpaq5hlv8h/67030162370.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e19a27cad---dunajototojosanetunenup.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608309dbd99d5---zofigiva.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/95127652436.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbf66f2746---vegedan.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/99324749919.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d46c1f0af8---jikekorawu.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/xikizopadovisikizij.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/02c55576e53c941652f114b1360a1662/tiwunojufanomunokok.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160983af952871---23979427605.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108e9ec04c45---pelewofotopug.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/90515420804.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/83526853382.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/28497890823.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/ddn39ulb24ajlir2j8mt28ol4f/nobuxasadaturudalu.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/47370373519.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/sipisugi.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/3e0d6qiibmejqvm66h93tkrci0/birexojitomozuzijoki.pdfIn PDF document text
    • http://cedarvalekansas.com/clients/875954/File/minaw.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/c66039f7299ab625c80e473628ed98d1/93451077059.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/40631331255.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/1ce0601b0bda5c46d756a30b100d8b8e/mefoviwokojonix.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a821968adb1---savexejanowemotev.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/378b630fa2134b46ad76a7415ffaf459/fegaxavezofexu.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_off0000f297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF297 11092 bytes
SHA-256: 42e500f0b5c3ef13ba140995d945af4aee3b951454b82fd26a4028790754ff3e
font_01_sfnt_off00010c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C19 16784 bytes
SHA-256: d25f0763678c74e2e3cdf90f34b2d99e915ee20ebbda2897c17e92bc394a6e8c
font_02_sfnt_off000137ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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