Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2df3b234f0790a5…

MALICIOUS

PDF

86.8 KB Created: 2021-09-06 06:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2fee2a0159ea2787d736664a40070891 SHA-1: 51b898058cc8e2c4795a5bb47c445a4091feefb4 SHA-256: c2df3b234f0790a5d69d55ba4e2043476a521159b03c7ee8f1f22f0355871b83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather as a container for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9eb01790c5757c7bad56e86a2ef9e665/76521043276.pdf In PDF document text
    • http://massimomoroni.it/userfiles/files/kesikusexupe.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3c544df82be595471242dc8228d2b8fd/xevifaravuve.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/43312293896.pdfIn PDF document text
    • https://petikdaun.com/contents/files/viwuvevipazuke.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/41771975338.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/47478725720.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/84903664608.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/29e1254fa1b7a7b5dc7297a9f42f84a9/sepalowid.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607178a41bc82---jimafupiva.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/faf3b17d691b6e6ee430062c369c02ea/gepupugetigekosetipola.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/69758398881.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160e68a07581a7---bazazuvesomonigorunakavez.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/dademekewabopusibuw.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8ac9777a6---xonenib.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/41332244839.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/gemaj.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/letemotizit.pdfIn PDF document text
    • http://altus.pl/userfiles/file/tipalelasawobaxogofomitok.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c56ceac8ec9---vevufewakutujexopesub.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///12780454605.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/wovajositarupozoxovo.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/nisomuxugivejebona.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/38f39a2033c0ae5ff39776b27d4d14f1/62725262751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=advertising+creative+strategy+copy+and+design+4th+edition+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_off0000ec65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC65 11092 bytes
SHA-256: 05d87540dc6ecf684cab1f35b88a7912b0bde75db35dc830d25cb9615988cea4
font_01_sfnt_off00010614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10614 17832 bytes
SHA-256: 97cc5d9d9e9ff5a2621905ed296e9a2a99a23cf7aaa9b3da258c3de716161709
font_02_sfnt_off000134ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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