Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d1a480fd3309d3…

MALICIOUS

PDF

109.7 KB Created: 2021-06-15 20:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 12a53c9604d88b8757dfc75d957b9cd9 SHA-1: 4c6deb7c6df1f75873be90a3c2707ded0f5ff2d8 SHA-256: a6d1a480fd3309d30892e2ec298b698f6e5352cc365b61b9c108f88925def758
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://philabc.ru/uplcv?utm_term=motu+patlu+ki+jodi+patlu PDF link annotation
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160750e7fac1d0---sagebu.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/88bcb25102d6335b9eee1041cb32d389/tezenudaberanaf.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c894d5b23b7---57278619127.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086efdacbe76---xonajuzasa.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/rlqumi10qq5h748b8vn1etq8f7/gozogaxodaxeguro.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb80ba9b5e9---regafimobomejatevifokofex.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/6j2dinh3ahlm2t9p8la94edscn/95956240738.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a842b52ec4c---fikogeluvoxosaxemej.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861df7ee80b---93068636504.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105180108245938.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa95ac4d63a3632e4cdc1d0c55a7b453/sisilodafovigesuriwekefup.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/75f881e4be6c878438e3baf072ce4ec3/giniruto.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3d292e6d8---57393741488.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd8c292416---87775680942.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/bdsn20hid4qvpe3d5ral7doqgb/98399306173.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b2f484a7358300d3dc59ec47bad6c677/63050015940.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE8 3004 bytes
SHA-256: 009ffac2b3241892d7436f83aa146aa3bea2e423e0497ab420db25418677c06f
font_01_sfnt_off00013799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13799 4824 bytes
SHA-256: 678fcaaf8d1ad5a43853500efa8ba8bfa9e29c7e770ea25b0c152795015c1d39
font_02_sfnt_off0001481d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1481D 3720 bytes
SHA-256: 40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b
font_03_sfnt_off0001537f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1537F 11944 bytes
SHA-256: 0ff02c8cd42104a6423f67f2d778c41f98a0cbba72d69a262d773e2c8c104b32
font_04_sfnt_off00017c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C9B 16800 bytes
SHA-256: a125f43bc352967a33979b2937c0dbe79efbe0028340185a70cc07c716084acc
font_05_sfnt_off00019497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19497 5500 bytes
SHA-256: 9280831b07b5bee0512e3eae8c5ce489ebe71b30cf235c64bf9992dd25ad2067