Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ca92cc7d22e84b…

MALICIOUS

PDF

81.3 KB Created: 2021-10-11 10:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cf7fba0240261473ab094317d466079d SHA-1: 1299c313e2c0ade1d3e2eacf17d352d2eb1e5c65 SHA-256: 82ca92cc7d22e84bea50478ea4a0bf26fdcfba8e91101d3b0443c0bdf542a19c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution scheme.

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://chcial.ru/uplcv?utm_term=last+episode+of+my+three+sons PDF link annotation
    • http://afro-safari.com/upload/files/80896807298.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/lobotinuxarovoni.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/42371737365.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/32544651424.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/18304563864.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/xutupasigew.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///ketenigadovefo.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/36612731419.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/lj94bg7i4mpk4iu592o8nt9btb/69065749276.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/6631697491.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20219261352102921.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/potefujebefukibabawizeje.pdfIn PDF document text
    • http://all-premium.com/user_file/files/furifunalazutowisipitir.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161593eee2daa8---mamugibuzamusixukuzimujav.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/fe42de18467d3c99967a9230c76efd47/48004345870.pdfIn PDF document text
    • http://lejuriste.ru/files/file/82090688265.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ponc7brmne0ietqv5eavdkl0n2/zidabozopowukoviwom.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210913121321_1547902129.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16153a4f65d84b---zusigajojuxovum.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/27213848310.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614df835826de---joveb.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/29075126396.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/11813050655.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_off0000d716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD716 10788 bytes
SHA-256: 5a9fd268b0b8ecbf36be05e554a6bec74a45a950d22c8d269e0859597da57c39
font_01_sfnt_off0000efc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC2 18476 bytes
SHA-256: e1f87df1c8b1db2b286dabd3bed2420de85a705723f6eb028c5b95b0451d0ac3
font_02_sfnt_off00011f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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