Malicious PDF — malware analysis report

Static analysis result for SHA-256 815346c19f9e5148…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 19:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ae299e486f902b259f2cba0c2542cca9 SHA-1: 4b52a4b6c96a8e83757bf5a287bd07721e2c8374 SHA-256: 815346c19f9e5148da64f3d250d6186b2c914715e09727030008a9ec1d159071
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains a link farm pointing to numerous compromised WordPress upload storage locations and other disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted, but the presence of numerous external URIs indicates a strong intent to redirect the user to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ladangmimpi.com/contents/files/tunesutudibivibazofe.pdf In PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ca8361693---30696580239.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/vekoneworuj.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/69812881968.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/93513230651.pdfIn PDF document text
    • https://2acontractor.it/images/file/balulibud.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8a9c1045e8---78052148287.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/80090af349150e4921b96858ff33720e/kufowofikivagirujuso.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/61393856481.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/56093588152.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/70100240860.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac08baa5d3---semerafuguritajevejizijeg.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/44759708140.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/derakoxotewegedugiwi.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/bb4d1fb0f8b4e384850abe54ae8b4058/98116457126.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dq2flp3pmti52kna0d31l6b3am/63497223976.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607933cc6f2f8---fisefujef.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fea921953---29647274563.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fe67c4bdca---72014944614.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d82aa523ab---20356693.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/wovezaradidoxufoko.pdfIn PDF document text
    • https://sca-kc.org/scauserfiles/files/soxemoro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=differences+between+among+and+betweenPDF 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_off0000dc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC98 11000 bytes
SHA-256: 4889048b4464b9017fe31e9ad37b98be22e41ef823578e08008214d253a04a3f
font_01_sfnt_off0000f611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF611 17256 bytes
SHA-256: ea5c6d13de4ef9272a5e69eea27a21855640d010eed0082f0603a100ad5510c2
font_02_sfnt_off000121d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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