Malicious PDF — malware analysis report

Static analysis result for SHA-256 2686a8b81401520a…

MALICIOUS

PDF

77.9 KB Created: 2021-09-17 07:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a04e0a57ba9b95f5d1cbc1ffefdfe93f SHA-1: ef7553ab445151511e9927d7bf91738d0007fd44 SHA-256: 2686a8b81401520a0a5d873e6cfe2a5ae2da42b5058ac14a821a410c5c756dfc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous URLs, including those hosted on compromised WordPress sites and disposable domains, indicates a strong likelihood of phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://garglob.ru/uplcv?utm_term=ipad+air+3+32gb+price+in+pakistan PDF link annotation
    • https://muacash.com/webroot/img/files/netarexosanewox.pdfIn PDF document text
    • http://farmina.ru/uploads/files/60939708736.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/34662142998.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161405a6bbb8e7---31709277286.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e056f01aac---wimibavuxadumadekov.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/30901764152.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/79635750997.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/bepeturawubowisomiwixux.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e0bb1cfb56dee9d35d74a3e3f6b5a714/45274064151.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/13976404372.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/71253169360.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/27892614755.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/duxajinogafugi.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/15148920502.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/40552214661.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/53844315170.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/51509595675.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/toxigutelunaf.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/40420309974.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/8409226728.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/xifanelunaj.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/29634690021.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/74105340054.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/690735710.pdfIn PDF document text
    • http://debten.net/UserFiles/File/jififazoj.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94291034130.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_off0000caca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACA 11000 bytes
SHA-256: 5864034d16dcb3d779500dcfd4de794efe4b92478d6ed7df523347fe5efb568f
font_01_sfnt_off0000e422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE422 17272 bytes
SHA-256: 4ae80575746faad263cc3dd2015c80a24a60ac2e870f9d8ee101c79eb09e85d2
font_02_sfnt_off00011153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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