Malicious PDF — malware analysis report

Static analysis result for SHA-256 278ea4253f71066f…

MALICIOUS

PDF

81.2 KB Created: 2021-09-12 20:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3c44f3c530b4139f2370587c718dda34 SHA-1: bec248e1b529d1ac0faccaa0f269dda0b0c78cc0 SHA-256: 278ea4253f71066f5d9a7a1cfd34bb9baaf242cb8e7a00d11860aff1e770d6f3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for malicious purposes, likely phishing or malware distribution. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=btd6+hacks+mobile PDF link annotation
    • https://tourpon.kr/FileData/ckfinder/files/20210911_3B73A7FA97B517AF.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/gipepugusugonuwufobor.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/kfms0es5oeoni06vb9njlrpbo5/58013070557.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/48565029341.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/30873017034.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/vuxakeribimejeronazefite.pdfIn PDF document text
    • http://qdcmd.com/data/files/45863626421.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109101949107430.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/27621687175.pdfIn macro / runtime command snippet
    • https://moveo-sport.pl/userfiles/file/pegutivegesedob.pdfIn macro / runtime command snippet
    • http://clinicaveterinariagussago.com/userfiles/files/rilizunekusevuvowifevum.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/varerevuta.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/42068616627.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ac6aaabb39dce2dafe004f055efea548/kupirotadebatax.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/10202160794.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7927e8ea3---37348665947.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/78678752339.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/lufetepajo.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/bupoluwuji.pdfIn PDF document text
    • http://www.andreapondika.cz/file/baweniwiguzexeribunukawo.pdfIn PDF document text
    • http://jngf.cn/files/file/7450424274.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3f8eb0b63---5531621040.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/91990221889.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/leluluxofirezeju.pdfIn PDF document text
    • https://charming-dc.com/uIn 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_off0000d737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD737 10884 bytes
SHA-256: 203f3ec7b731c88cd7c6a360c8e3313ce42c1ddefa5569757f5bcde572fe97f0
font_01_sfnt_off0000f074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10886 18068 bytes
SHA-256: e627cabafad23862fd483d88f2b5905a9a607ee90a0f96f16d0a443177cdc3db

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