Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a270465a795173c…

MALICIOUS

PDF

74.2 KB Created: 2021-09-04 16:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9fb69b0ef34b63d64a7ec9405e87f47e SHA-1: 3b9fba4a5de65f9fdfac4bab7ccb7cf3c54f5363 SHA-256: 0a270465a795173c39eb67e192fadfbec33a22f6bf0ad51c893571d6bb983085
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also functions as a link farm, directing users to multiple external URLs hosted on potentially compromised WordPress sites. These factors, combined with ClamAV detection and ML classification, strongly indicate a malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/2a906678f31c5a5a7204f34bd78c4310/52303412699.pdf In PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/66437050827.pdfIn PDF document text
    • https://irantruck.ir/data/file/ravenelivukeze.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/12240032245.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/35590472239.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/pisugalixasimudakap.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaa1b8cf9f---soroto.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/5e114819efc7704be1ebf8a2a16851a4/94648666357.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/73852849957.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/2533050038.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/zawejaleretogo.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/gcd3o3qcbokhh2in3aivfttb85/71010788467.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/bk47e0rh6fae0mact8c7chvu7l/49578176649.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/fusovawexa.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4abf00d19---mawiwuletapak.pdfIn PDF document text
    • http://ahchala.com/img/file/vonetopumodimoboxiritu.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/femidawanijukifezur.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/guwibet.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/97631040611.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/76723002598.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/62031153444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=apc+back-ups+xs+1000+manualPDF 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_off0000bef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF0 17100 bytes
SHA-256: c2acf6b938570efb347dc12a22dc084923cf5a73e344c9aa580057cec208b1a7
font_01_sfnt_off0000eb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB73 10616 bytes
SHA-256: bb0225014031a5feea929e535193a289a14fb67d11424508ea38b4866a285030
font_02_sfnt_off00010396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10396 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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