Malicious PDF — malware analysis report

Static analysis result for SHA-256 a70eb53921f90e4d…

MALICIOUS

PDF

74.1 KB Created: 2021-09-18 10:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7194442ebcf109e822fd944f6990d0bf SHA-1: 1620d2e7d0f271d57a17aac980958c8d810e4a1c SHA-256: a70eb53921f90e4d4dedc61ecf1bb422984ab0ba6842aa3df0b5fa5deca9706c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The embedded JavaScript could be used to further obfuscate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/49902533965.pdf In PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/mujuvaluterurinazu.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/fupubem.pdfIn PDF document text
    • http://novichiha.ru/pic/file/mefekawikuduvazekane.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9458221fe---mezijanelekitom.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/44723041864.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/47324638471.pdfIn PDF document text
    • https://airxps.com/userfiles/files/jezabipexezukixagebu.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/desowizax.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fccdf6369e---vakax.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/temovoxizotebabun.pdfIn PDF document text
    • http://klinok-saintp.ru/files/kigukuvakutoromukedanarap.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143ce1ec3610---nobetizudipefisopavisu.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/9190938213.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/38674218671.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/senamalevedofugakitumapop.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/dosil.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/gilabenebidisutav.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/xulutinusafagi.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/lekiwumavoxuz.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/bamemiw.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210903163067564742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=watch+the+friends+reunion+online+free+123moviesPDF 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_off0000b8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B2 11244 bytes
SHA-256: 32cf47ef97b2e2a38e959f2320380e4f22b46e5092b9d345942429c2a65eac94
font_01_sfnt_off0000d30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30B 18204 bytes
SHA-256: b9bef13019ba3c8bc297ad2d2e0f34b8ff42a9f1b17339460bb2104257257007
font_02_sfnt_off00010265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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