Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a189f04cb381cd…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 13:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 93f90cf963ef8657b9787c2cf96382be SHA-1: bba8c19ab4f4f351866c3d6150241d9191629ef0 SHA-256: 63a189f04cb381cdc0e692f6d7a677af1bba62904cfe3e2e853d099265678fc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to potentially compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to redirect users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://garglob.ru/uplcv?utm_term=homemade+everything+bagels PDF link annotation
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/2ea5a4027bd37a96f6296f9001b69deb/99701544914.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/6171df1972aa4f7ac3a620dbb5ee68fd/66611796688.pdfIn PDF document text
    • https://rumusjitu.com/contents//files/bugovixuvagedetisov.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/kiperivivomevewenetukatig.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/kobudawidiru.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/568enbtmbcpu5uujp3a6n0tqv7/tukakinuramowotufe.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086205b05073---67684734132.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/xedemajatuzija.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/tamaripafe.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/mazerobikogiwodafome.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160f15b8c6cf40---tisezoromodinovebibinos.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612754141a39b---belak.pdfIn PDF document text
    • http://okvin.org/userfiles/file/96607237871.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/xixodufikurunuro.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/idgm851ejv3ne6oa60ev3bjvvf/gobatubemow.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/naxasolekon.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/9926fa2cedaa907384d7e28856f0ad6d/tutuvo.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bd4ac62fa---67371990935.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/81754495992.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/59320882262.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/xesovulifu.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/fiwejadojojelofaka.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/25980846162.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_off0000d63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4D 18092 bytes
SHA-256: 5ca7a8a4745925dd9e0124ce726e85bb0c28a35f0151a3b415df0cd90621e24f
font_02_sfnt_off00011c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3C 11004 bytes
SHA-256: 0ec3b503da685ad30e84298eb15b0f1e27024fafaa1623b9ac063db9a224edcc

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