Malicious PDF — malware analysis report

Static analysis result for SHA-256 11bcdec3591a2589…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 08:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 351343d3449d6191121ecd8362137dc0 SHA-1: d7da45a9c1426bd2140dd5bf8f1c73c6f2a54e32 SHA-256: 11bcdec3591a25896dc01cec7bd0570c665b9f2a663ea2e720066896ab480549
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites, including those hosted on disposable domains. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, suggesting it's used for phishing or as a trojan downloader.

Machine Learning

  • Nyx PDF Classifier clean score 0.2133

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efce8d0681---nixepetozegibigo.pdf In PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/40223094855.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/40053409606.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a93eb1a91---jilitifunibomubi.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/baxugogotomuxebigonifu.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/77012197268.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/97924382514.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16146b2d1c12e7---dopubuwadedapokelot.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0248c3e72---pupejulaj.pdfIn PDF document text
    • http://klhl.com/userfiles/file/dasimabenosanuxizaxug.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/a3368329cc53a81c294926b3027900f3/91669576584.pdfIn PDF document text
    • http://mq-water.net/upload/45059598525.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/61515947178.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/pubafapux.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/um1dfrdt6icconmen4sb5mpu1q/dufezun.pdfIn PDF document text
    • https://anfauglir.com/images/file/mezuketisa.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/92985366257.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba11bfa98---raturuxatifuvikija.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/0ba0efa753273c961b37016bede96aa5/99617153025.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2b8c1ebaf64ff1e2d1b0349d120239cc/81876095186.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/50380162520.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/71396022027.pdfIn PDF document text
    • http://precisao.net/files/files/17630609399.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5770eae0b---mejefufukowamutip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=mi+system+app+remover+apkPDF link annotation
    • 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_off0000e6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AA 19760 bytes
SHA-256: a7b5a6336b902f67d30e7ee9a66ea44008f54b9437c41d021461761c4b3ff27a
font_01_sfnt_off00011b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13386 10528 bytes
SHA-256: 65e0d50489587aa17ef03876a4396b4639f5f69c47ddc9677f48038508f1e012

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