Malicious PDF — malware analysis report

Static analysis result for SHA-256 13581c2018122271…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 18:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d48c20f5afbe845b1d735d1abcc18dbd SHA-1: 122153fae970b40e4170d40c66fbd5cb65206745 SHA-256: 13581c2018122271094f85c2d4d6a4b7fc35983ef0e2fc87dedb255019844f92
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://duquenne-moteurs.fr/webroot/upload/files/sibitewegiwoxipejesodura.pdf In PDF document text
    • http://korio-olsztyn.pl/userfiles/file/44689822677.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148d2838899e---68887261505.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/79913273407.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202109091720146474.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135b57f99521---pojefubidewoguxe.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/vezobiduw.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/70679070964.pdfIn PDF document text
    • https://regenerateacademy.com/file/fuginexoginuwi.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/xiwotal.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/fosororazopopugogubuti.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/24920173501.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/kunaxo.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/80258014293.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/jinate.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c36798f9fe---konebomewuvawibutuweroj.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/zofenominemizirovopunav.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613328df36bbc---xixije.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/sukewigajanuvupawaluwis.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/papogarovowalufon.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/megipibagotizafaxemeripiz.pdfIn PDF document text
    • http://neteyes.eu/editor_up/mevisujujifuninif.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/94563582107.pdfIn PDF document text
    • http://kodemari.info/data/files/gewinuvel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=minimalist+icon+pack+apk+downloadPDF 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_off0000af73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF73 10616 bytes
SHA-256: 490ee775c46c5e5fe4eedd538534d989087ce42855cc4cb82d2d081776b96e61
font_01_sfnt_off0000c7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD2 15512 bytes
SHA-256: 488d92f581ae6c5438da53cf1fa8eac0d5c0957c5b4f303fa0c2605ad2ace864

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