Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae1cf305dff7f570…

MALICIOUS

PDF

93.4 KB Created: 2021-09-23 10:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: adab98209c8a87d1567d17ed49e1c4c7 SHA-1: f10ac58430ec47e555a51973d5255d33845b9683 SHA-256: ae1cf305dff7f570a02f61f90ad7753e996797367af1da272db75843c0fc429d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also functions as a link farm, directing users to multiple external URLs hosted on various domains, some of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://catamma.ru/uplcv?utm_term=android+circle+imageview+github PDF link annotation
    • http://rajasthanmetals.com/userfiles/file/87787977160.pdfIn PDF document text
    • https://ambalatender.com/upload/files/guxigexubugemetebewaguva.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/18b15881bce9424bca1feab68e86bfad/98658929624.pdfIn PDF document text
    • https://cian.hr/userfiles/file/depotesomafopavozo.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/vofepimem.pdfIn PDF document text
    • http://bushurov.ru/images/files/67446511664.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/safovatuwexureko.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/meguka.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/tuvazatavuxadizomiritesil.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/wusagoze.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/zenepeduj.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/xaxenobuxakumonodoteruri.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/61363026223.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/82977037474.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613075b067452---demipudut.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/86518962594.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/96851384400.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/rusudokiriruj.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/sutikidupa.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/50443533912.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/11363512143.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/67725206829.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148120a309a3---63877052410.pdfIn PDF document text
    • http://makaroma.fr/upload/file/78883847920.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_off0001016a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016A 11024 bytes
SHA-256: bbadfdc135d1b32cf70d0a95b36ca232470c642aeafc42ae3aa0e69b63256b54
font_01_sfnt_off00011aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA6 20476 bytes
SHA-256: 43c019fcefb682f53aaad22a7f0b8592f601923e3b0fac1675f68d3d99ba514e
font_02_sfnt_off00015068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15068 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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