Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5509943ef26e430…

MALICIOUS

PDF

73.3 KB Created: 2021-09-10 16:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 310af53e16dc655150c35da3f1abfe6f SHA-1: 30f7563c848a3ad22c368c8a9d7051b0dadb0b4e SHA-256: e5509943ef26e430bf563753398106e559c7035ed204efd7788776d1575aad4c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to PDF files hosted on potentially compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a link farm suggest an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware.

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 http://ilovehikari.com/uploads/files/ruwugibexoga.pdf In PDF document text
    • http://carscaso.com/js/upload/files/6738457664.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/nimusazawo.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137ebd42f3d1---wumaxamedakafabawi.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/rufulalusamubenemogu.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/52084388468.pdfIn PDF document text
    • http://pk.mo/userfiles/file/terike.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/zelowaluji.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/73606370602.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/welutas.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/46718985948.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133985fbe2e4---66918378757.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/10405599226.pdfIn PDF document text
    • http://ipceurope.com/assets/file/puxujid.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/pebinomutuz.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/77350993194.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161322e890317b---69656886741.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/33136354527.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/53610233235.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/86647626494.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/67683369288.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/52355974552.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/16723144083.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394e9b06400---57396370430.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/xolunizavedegisolexuru.pdfIn PDF document text
    • https://rm-parketi.si/uploads/nexisovoperasowolorutogo.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/64371833918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=download+flash+callPDF 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_off0000bce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE6 10236 bytes
SHA-256: 7753d993d165f9b14ccf04daa0e441af5357c21a7e252eac425c83027dd8923c
font_01_sfnt_off0000d3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF6 16908 bytes
SHA-256: bc6435a6c884339657db174c02cf716c7651be28062a5890c6ee4b064ee5829e

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