Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d5f598d6d72000…

MALICIOUS

PDF

82.6 KB Created: 2021-09-08 21:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 85e7762f4f3d7347d1cf698357fdb4f1 SHA-1: 6b5c3b0fb4121b9fab54ca095d0e1845bf2c13d5 SHA-256: d1d5f598d6d7200042052776562ab672f40b4194f4e2cb4bcc69b96166806a5b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=flying+shuttle+industrial+revolution PDF link annotation
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/fe75bd007659deb5a6757b7c8ba25f12/10603460480.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/bewesagodakudumurawob.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/12374403953.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/67992624672.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/59953211561.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210903194816.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/0hcivn98q0q90e0io40pdoa4s6/88755362173.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/49116357821.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/satud.pdfIn PDF document text
    • http://e-sportis.com/images/upload/runawoderemodivukilolonul.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090522453273499.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/daxoxosojipizukigidazebez.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/al845tqslrk8iq7qutnunl3hje/63348377472.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/morasuzol.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/kalivut.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/61852946045.pdfIn PDF document text
    • http://texmet.pl/userimages/file/35860410998.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/wileriwagikipikam.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/tedowepokewalu.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/73795276369.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/naviv.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/26894981411.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/mamujux.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/pezegejogapaj.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_off0000def6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF6 10784 bytes
SHA-256: f5a7d8b7ba043c683c22815958cdbcee8fba341faf18524903b4ed1904e181d2
font_01_sfnt_off0000f78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78D 17500 bytes
SHA-256: fc80fcc126758c2e9febe0ecd9cc6216b16e14b25aff3c97ab9451873cb88bd5
font_02_sfnt_off000124b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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