Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a2b232016cf9d65…

MALICIOUS

PDF

85.9 KB Created: 2021-08-16 14:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 46e7807bfc9da8d3dc5a3990e4894014 SHA-1: 9645e4466af2ce97e539825ba053b8cac609d7b1 SHA-256: 3a2b232016cf9d65cd5e2ebd08551b0b4cc3565cf71cd391f8d0f167cd1f41ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is used to direct users to potentially harmful content. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketchas.ru/uplcv?utm_term=how+to+wrap+a+gift+in+5+steps PDF link annotation
    • https://cengilli.com/icerik_images/file/18298563652.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/kexodewuxeg.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/63c2fde42aabef21f1009a62f98dedca/lotiz.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/6ba1d27c74251b414c8c09c0525a7a0b/49953271740.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160906309f288e---70750107861.pdfIn PDF document text
    • https://blugarden.eu/file/29885744783.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160743c6a3bef4---fijunurujuxikowevisiviz.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/82728142330.pdfIn PDF document text
    • http://e-hematologica.pl/users//file/bufunuri.pdfIn PDF document text
    • https://samavetah.com/ckfinder/userfiles/files/15340938479.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/94260020603.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/pamirub.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/tevivesegopivapazit.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090141983f97---31701659462.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210721145953.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/bopumute.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/91496924180.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/pejefujiguj.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210725021111.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021081218445373499.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/reregatazawusifuvubodamo.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7c71c406b0---4448565735.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4bb463214---zavatazesuxoxudavurawe.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/mmiolrnngtlh2c4jm5q0bm38ua/61249192963.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607351468ebf2---81832296025.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_off0000ed3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3F 17024 bytes
SHA-256: 096216b3e931bd766cf0233ac562f8d18e079bf1f32f049e3da33de0b3ef7701
font_01_sfnt_off0001199a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B1 10700 bytes
SHA-256: d6f8d488e8a278b6573387b8c8c77713416195110b4099c21bef6b883fa9f0aa

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