Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0d9b955b97fdf6…

MALICIOUS

PDF

85.5 KB Created: 2021-09-20 10:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4a3dc7f88d41003075171154ba3dc8ff SHA-1: ade4ef8ccba358bd3954c62f8fc01a1893920330 SHA-256: af0d9b955b97fdf6d3cc2fb7e63d8882643afe305cd5aef307a9774e01a3014e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of 'LOLBin token sequence' in the document text further supports the malicious nature, indicating attempts to disguise malicious commands or URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://irlanc.ru/uplcv?utm_term=padmarajan+short+stories+pdf PDF link annotation
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/3f0p6cclo3c7eqiviqbbg88782/69669372964.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/40951951005.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/62049133552.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/vuvanudag.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/vuxotujanuboz.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/dijozisurajezalope.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/38415860152.pdfIn macro / runtime command snippet
    • https://qkon.ca/images/file/9657609580.pdfIn macro / runtime command snippet
    • https://helicopterleasingservices.com/userfiles/files/vinokunepiju.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/janewavukifu.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/74188280583.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/35877930449.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/xewavurogikedemadabet.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/57680922769.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/kepoledom.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddbd305c4e---ditevekibeviduwixuxuna.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/gixogujinagajojuz.pdfIn PDF document text
    • https://computerzone.pk/file/84480930488.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133582ba2fbe---28480392479.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4d4da6f46---57613606249.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210915172139.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/detilokizenubovevof.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/tst7lnonpr3sigck2pf5fk946q/56948349346.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/cqolql5mbl6odrakid0l2vaq44/31141768107.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/10382318831.pdfIn PDF document text
    • https://edubox.mn/uplIn macro / runtime command snippet
    • 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_off0000e8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B0 10848 bytes
SHA-256: 4f7db2db77fce50c33bc768be59869ab96059e5880f9567280c84b98b20c98f8
font_01_sfnt_off00010178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10178 18196 bytes
SHA-256: e9dc9e87c89b25923fb3687a98eaae1c49e2237b09532164a0f849f462d0b062
font_02_sfnt_off00013021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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