Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a64638cb2e5e38a…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 10:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4f6fc9bc0fcae8d7b1f6260a4a825f21 SHA-1: 7ed4043cd08c551007ee48bc8045d4dc6bc3a30a SHA-256: 3a64638cb2e5e38ae70e90b6a19ab3a19b79e45a3f78a79c1f5825533ce971de
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points towards an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=the+kissing+booth+full+movie+video PDF link annotation
    • https://e-fasteners.eu/media/file/tuxesobub.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/pivezusisozaxoneguzivefag.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/dixafameketatomuluxu.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/56998147130.pdfIn PDF document text
    • http://calisnt.com/uploads/files/76559882405.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614f95b49afd7---vasivapejaxutilineruteze.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/31124580386.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/fapad.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7aedcb095---gezaviwegam.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/domux.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161496d4dc4d54---dikezosaboxulimevo.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/19883723184.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/nurapofugafugobosomu.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/97371622977.pdfIn PDF document text
    • https://magic-ray.shop/uploads/files/73098963649.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/56777035438.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/tosotajajubikove.pdfIn PDF document text
    • https://subded.org/userfiles/file/negexobilut.pdfIn PDF document text
    • http://netflor.pl/upload/File/levesodurikij.pdfIn PDF document text
    • http://www.bash.cl/media/file/xasujunudubakenevuw.pdfIn PDF document text
    • http://attlas.center/userfiles/file/53530236874.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/38688079040.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/rofavumixixanarofo.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/19839895299.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_off0000b07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07D 15300 bytes
SHA-256: 1922f8a6c9f6c8328178bbe5d562019dc4541a461a4174e2fbeb4523fac59cfe
font_01_sfnt_off0000d66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66B 10900 bytes
SHA-256: 7b13f5804b464c6863deb8d345ab9a5587554bcaf4eaae9fdc1b7a644ac7e5b3
font_02_sfnt_off0000ef49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1