Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4a357f8dd9ca59…

MALICIOUS

PDF

80.8 KB Created: 2021-09-11 02:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 824276b3a64232eb62d6b0e965a62635 SHA-1: dc5499508ac3be54286f0a6464e3f46416dbce53 SHA-256: cb4a357f8dd9ca59013ea541c6bd13fe42508ec5566f296d0086a4a4d867b7e2
164 Risk Score

Malware Insights

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

The presence of embedded JavaScript and a large number of external links, many hosted on compromised WordPress sites or disposable domains, strongly indicates a phishing or malicious redirection campaign. The ML classifier and ClamAV detection further support the malicious nature of this PDF, likely intended to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/27187146006.pdf In PDF document text
    • https://aradmissions.com/ci/userfiles/files/varag.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364fd0e2bf7---55399108365.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cc3332a4c---97800963889.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/gunukelimuvogorog.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/nagoj.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/sogorosabipazafu.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/sivitaz.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/82432009646.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/88473138962.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/37048673956.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109101204198066.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0451268001630670193.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/39937341501.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/03pe5ajq8v3jk15dkq8bhpihai/nikupum.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/beguxevokoza.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/10771783361.pdfIn PDF document text
    • http://uhorder.com/upload/files/29063042640.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/27178199187.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/82941573582.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/17078458176.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/56835810666.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/94352702031.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/8942823169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=using+ndk+in+android+studioPDF 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_off0000d867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD867 17200 bytes
SHA-256: e935ccfb70304b07c8c893aee1ae11677d7101260683ea98896042418f373faf
font_01_sfnt_off0001059c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059C 10444 bytes
SHA-256: 95463e8473f985206faabb1a3827810683e25928eca17e919f80a5f2fe9a1430
font_02_sfnt_off00011d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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