Malicious PDF — malware analysis report

Static analysis result for SHA-256 944c00ed0d39bab7…

MALICIOUS

PDF

82.7 KB Created: 2021-06-20 14:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 8e8d2c7a14bd4f6a55c0c1d8a9beeaf4 SHA-1: eff212e78c53e637fd2b9e293cf23f18569e4f04 SHA-256: 944c00ed0d39bab7c45f2615b577896dbdfb42059deadaa19861cb5d1cd6f614
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 0.9993

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://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/503abd9835e1de9be46ca954109d93c0/wuzikenuzed.pdf In PDF document text
    • http://shosholoza.de/file/mozefejolaxalusisenuno.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c642acf2ff---pemuwexomi.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/wepawipozuremoxeridaxip.pdfIn PDF document text
    • https://steammining.com/userfiles/file/56625622913.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f0bf4431c---71114295477.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ea112d45d---xijaruk.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c505d9ae7a929ca9d998c5098a112f3/wumubazotudesu.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e29212fae---11925090970.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903f8c27320---94513970904.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/0sftn2f3in25cg0o6emo1j4clb/losalewazuxilefoxini.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/kinadixawominota.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/37948195898.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/konunevawe.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/tbg4dlsnvpjrm9auprkrpkd2b3/2343416317.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210508060841.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/71580877078.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/jorixaposuro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=jitni+dafa+dekhu+tumhe+dhadke+joro+se+song+downloadPDF 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56F 6384 bytes
SHA-256: 25c0bba19f432c36329fcb92034f94dd10b488a4dce69aacc8c0eb5d101bf100
font_01_sfnt_off0000e526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE526 5544 bytes
SHA-256: 375ef79247d0c36bea62268eaaca6a8afd3285d85f4d4f56be0286ac63beb3a5
font_02_sfnt_off0000f7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E5 1640 bytes
SHA-256: c40650804499b8cf3fe8bd45065cf3c6d364961a235756adfe9d5282abe60730
font_03_sfnt_off00010029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10029 11156 bytes
SHA-256: af6ddfa603a405e83516a9b830687af1828cfc585eee0f1c702313b482490ab3
font_04_sfnt_off00012682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12682 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6

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