Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6402f237b482ee0…

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 15:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5a5b31fc647328c37de9e22f2c6dcf13 SHA-1: 54ad460aff294a9a59a314752d8ce3182b1ebca7 SHA-256: b6402f237b482ee0f072e289604e5826d12574441427d7a79005aad3d6a05555
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan, and an ML classifier indicating maliciousness. The document contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. Embedded JavaScript streams are also present, which could be used to further exploit the user or redirect them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1e612e2139d19124bb2c7c229da8d3c0/67850565151.pdf In PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/4720033592.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/53544143901.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/29233200081.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/29033464601.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/45748954404.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/vekuduwif.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/nesevonofamogotelesifeka.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/fexobimasela.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeee82f91c---18185816439.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/wipesobilidodilitu.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/71892752103.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094857dde90c---71199922046.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612bb058cd442---33068334148.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/44845442261.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/wovisekakadokeloxa.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/vawunolexabojepiged.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/majajesopore.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c38a6060695---17851808040.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c551aec3a---raxunisumaxikuxo.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/bedowemezivur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=saraswati+chalisa+download+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18A 10744 bytes
SHA-256: 8c43a9e3115be6bc1da49172dd908f9e3883a76e0d65003ff767d274bc358e93
font_01_sfnt_off0000da27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA27 22012 bytes
SHA-256: 9711cdac63a0b4f4610b3c3cf5eb69463edfca578b85eada02ae47405ebcfcc2
font_02_sfnt_off000111e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000129f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F3 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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