Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f17d4dfde9c8e5…

MALICIOUS

PDF

92.3 KB Created: 2021-07-17 06:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dab244d41a22bcb06aac82c2108de637 SHA-1: 44f97a1ab715be093d8f68a872235ca25105d725 SHA-256: 15f17d4dfde9c8e51c9f34bf6dec4e3d6a08b6c0bab0ef3d83ae42a97c4c907a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links pointing to various websites, many of which are hosted on compromised CMS uploads or disposable domains. This structure strongly suggests a link farm designed to redirect users to malicious content, likely phishing pages or malware download sites. The ClamAV detection and ML classifier further confirm its malicious nature, indicating it's a phishing or trojan variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/eh7ob3kuvou7b26ofjomb0kc5k/7012603668.pdf In PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/ed3d2814d46dd9c76d7582a6eea69451/45565198602.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/fatepedisinobezu.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/98783074240.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af787abce51---31135966115.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/24163934972.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad398621d---rejibopaduwupiviluj.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/walegidasigofoziwisebimab.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/15938482339.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/iqd2k352lg44fjdgtstldgdv27/wujorufew.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/cra0faoggum9bad0n0e1akio32/fifumavetino.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/62778668529.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46078894607.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/50bd8e44530335908d362225ad38a924/jopukukaduduzibizidigako.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/d42def8c27bd92f127247006de049d74/rovidezipude.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/bebigun.pdfIn PDF document text
    • http://skincarebylaura.com/clients/862251/File/39015904405.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/jivisen.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/tilasaginotubabe.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021051609275973499.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/o7akulh5cbmhftskl3el089p01/87286268119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=tcs+interview+questions+and+answers+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_off0001041e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041E 10928 bytes
SHA-256: 909eed32ca0fd888609da11d1de7d9f4a27e564013ef23cabcde7726bf55806c
font_01_sfnt_off00011d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13581 17636 bytes
SHA-256: aa821a3da4a716954fca90f4dcc473d1404a030ac9ab9a5c2a2e3943b4418e6e

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