Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6bf5669df39a54…

MALICIOUS

PDF

81.3 KB Created: 2021-09-07 15:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3bc20c46c7a77a3bf05eeef03d023a26 SHA-1: d4b7cd5ab0342982b3478a7df99ab30c9842bb09 SHA-256: 9a6bf5669df39a54239ccf9c9b3ecc17397d4038bc0837fb71ebb98b6aae7d4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to lure users to malicious content.

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 http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/l9joqv7vl7mh89rqq5hfen51k3/ligamilosuxagi.pdf In PDF document text
    • http://tech-in.info/bramy/userfiles/file/poberoto.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16099224c227cc---84612834485.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/muluruvijubepakiforeligu.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6614ab2e5---96114092012.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/vaxekevezeko.pdfIn PDF document text
    • http://sivam.pl/files/file/27778878926.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/3967662304.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/389204445.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/31526281586.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/kuxujowu.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/ef6n65rrp2oi3ovrcnk2uo8dn5/12958669511.pdfIn PDF document text
    • http://daycamhoa.net/upload/UploadFiles/files/40341513814.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/kmk6i1u5gu19k57tpq3umeakmj/63352246835.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1610aa57cef86d---50631989245.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d944c87cb3---56977268423.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/47209394927.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8865cb3ad3---72714318029.pdfIn PDF document text
    • http://proxima-design.cz/files/file/79252304377.pdfIn PDF document text
    • http://dytac.hk/userfiles/11931191651.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/7686971587.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/8ao8db0ir9c7nree8ekr0fuq75/zujozewo.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607640aa16377---62547347208.pdfIn PDF document text
    • http://kasargod.net/uploads/file/34558972046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=2008+jeep+patriot+service+manual+pdfPDF link annotation
    • 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_off0000d34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34D 11432 bytes
SHA-256: c64f10de27b66f794854eac7bdc923642f7a886604428be666f3108886f7a496
font_01_sfnt_off0000ee51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10663 18636 bytes
SHA-256: d56afe1e48d9cb16be056c41b9cc8457965fe181ff27672619395b729f816db9

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