Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9d3cd4f0af7ddcc…

MALICIOUS

PDF

79.0 KB Created: 2021-09-19 22:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ad1f5bf8496697ebfbbe7b3bc252af7f SHA-1: a806f06eb34f956b35ea8a7e383b6bae30567880 SHA-256: e9d3cd4f0af7ddcc021fba30e11cc645930df8c6201f325408478247f8140cd1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be disposable or compromised, suggesting an attempt to obscure the final destination or leverage vulnerable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://derfo.info/resimler/files/woxagepuruxev.pdf In PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/fekemi.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/zubizuvopixuxadaz.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/tuvuzofezasidi.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/26664269742.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/robuvavagigegem.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161418cfcd9440---jizobulanixefatum.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/98014400479.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/53864485638.pdfIn PDF document text
    • https://pcetravel.com/files/file/47401332860.pdfIn PDF document text
    • http://mamitobe.ru/files/file/26446242369.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/javetaxefabulakobufiveni.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/12413967432.pdfIn PDF document text
    • https://afayl.com/userfiles/file/33945695442.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/1639b6cd36f35aaa3a9ff169cea365dc/kofid.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/keniwirimami.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/desologabubetodozigox.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/71227554142.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/duvikewevo.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/39859392847.pdfIn PDF document text
    • https://istanajp2.com/contents/files/nowadekunokanalivebifusir.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/040527c4d587318a209a57666e50c69c/84100368282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=urutan+nama+versi+androidPDF 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_off0000d3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDC 10536 bytes
SHA-256: f9bec1b892191a69c34ee876771f8ec753a53058db43851a72e89b9c990a174e
font_02_sfnt_off000103d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D8 16228 bytes
SHA-256: dc6dcfde26ce985731e9b9e557a9f036667392fdc8b83d04a23e0b380762eac6

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