Malicious PDF — malware analysis report

Static analysis result for SHA-256 29937baadf3ba05b…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 12:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 596006e4b194a020b123e8e890d63f7f SHA-1: 09d6e9ebbdded3f7ed3598309b2d47e4af37e4e2 SHA-256: 29937baadf3ba05b09f0c10a90ba25836ffb05d5e63f260480af40e4e7f52cf5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to various external URLs, some of which are hosted on compromised CMS platforms. The embedded JavaScript likely facilitates the download and execution of additional malicious payloads, while the link farm serves to obscure the ultimate destination and potentially spread the malicious content across multiple domains. The presence of these elements strongly suggests a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://studioguidobarbieri.it/userfiles/files/78749166897.pdf In PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/16472543727.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/2627787476.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/dasifonivimelamokegaso.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/fifimejuto.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161344b8649cd6---56376105178.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/pikopakibabutufubixakapu.pdfIn PDF document text
    • https://purefeeling8.com/data/file/ditemiririkituxevexajow.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/popelibafaporedazedovekit.pdfIn PDF document text
    • http://ned.ru/uploads/files/kudowip.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134648ac22d2---71846524207.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/ridebif.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/37635045404.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ed5eddd11e9d3592371f57a39d71ed9/87988237525.pdfIn PDF document text
    • http://torgoborud.org/images/file/64121551536.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/67121129532.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/58573904324.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/42958625485.pdfIn PDF document text
    • https://wsbtitan.com/images/file/14980769961.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/nikimowaweturedot.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/16917704478.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/70473594724.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/41994198788.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/gosepidizupejewexorinij.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/3305521241.pdfIn PDF document text
    • https://12shio2.com/contents/files/64225987595.pdfIn PDF document text
    • https://linker.tw/files/debofikipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=processo+de+fecunda%C3%A7%C3%A3o+humana+pdfPDF 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_off0000dd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54B 19420 bytes
SHA-256: 6adccc1fc654bbebdb097dbc329936fed10504e71b596b764b7dd043f7528580
font_02_sfnt_off000124b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B0 11216 bytes
SHA-256: 222b25ead9a45bdcafc0839ccb5053ece1a2894c3c1d88af6f8dfd485e4ef314

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