Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9d9a033569ed78…

MALICIOUS

PDF

76.9 KB Created: 2021-09-19 06:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d08af46d348053c2689c246f1867258 SHA-1: 13e0fc5ee0470d43a6e9a482bef5927b3ec2ec49 SHA-256: 4a9d9a033569ed783a970b4a41c01a39d3a9ce466a0950dc02992894fd29ea9a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress sites. This suggests the PDF is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://archism.ru/uplcv?utm_term=rodeo+stampede+sky+zoo+safari+apk
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/b74c83546b9ff9229946723c49eb91c7/15342637885.pdf
    • http://przedszkolenisko.pl/userfiles/file/64795769763.pdf
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/97647892786.pdf
    • http://jafra-com.at/userfiles/file/83558582210.pdf
    • http://ecohost.ru/pics/images/file/ritatanexipegidikesez.pdf
    • https://zniczekowalczyk.com/user_images/file/3555550812.pdf
    • http://nincity.de/inline/file/gexowuzoluluti.pdf
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/73055327210.pdf
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/62286256106.pdf
    • https://drddvichitra.com/userfiles/file/nijovapufurabifupudanip.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9ce4ce173---vafimapiligetito.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1614251ff0dfa1---welovoruburexigebekonum.pdf
    • http://peter-crooks.com/userfiles/file/3448233392.pdf
    • http://uni-soar.com/userfiles/file/kigakubogom.pdf
    • http://taketty.xyz/js/ckfinder/userfiles/files/lubixiguzuxutiroxafe.pdf
    • https://raiporjai.com/piceditor/file/78737387395.pdf
    • http://jlsxjy.com/right/UploadFile/file///2021091012135573499.pdf
    • http://spostojow.pl/userfiles/file/101314640.pdf
    • http://kayapalinakliyat.net/file/jidasenawo.pdf
    • http://dulichtantai.com/files/uploaded/files/98497698012.pdf
    • http://daphongthuyhueminh.com/uploads/image/files/potubajikodif.pdf
    • http://simsvizag.com/admin/uploadedfiles/file///91690679528.pdf
    • http://tomaszskiba.com/userfiles/file/75599842892.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AE 16792 bytes
font_01_sfnt_off0000dfc0.bin
2e6d03fdadfea51c33305ef6d4da7aa6db1eaac1555a4f5eb282b89671da9d31
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 17436 bytes
font_02_sfnt_off00010c9b.bin
a80e9996cc42d62ec8da305647520e37b503bcf1a51a8de27ffa95709c46b0d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9B 10820 bytes