Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b858d79302f15b5…

MALICIOUS

PDF

73.4 KB Created: 2021-10-09 08:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 10d55ae54bde5c5a9b5deb0811496457 SHA-1: 3dafc7d5a3023b00f0123a0de5c0a17e3300bd5f SHA-256: 7b858d79302f15b5d0efa69e606bb40645e941d9a2b624e8636f71fbb58cb419
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs, many pointing to compromised CMS upload directories or acting as link farms on disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of 'LOLBin token sequence' in the document text further indicates malicious intent, likely related to command execution or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=female+fronted+punk PDF link annotation
    • http://pmrs.ps/userfiles/file/mubujejosiki.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/wuxevipotamogufidole.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/93564510580.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/jipetefolekaxuborarol.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/semobofexino.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140914066b65---30365583925.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210914192541.pdfIn PDF document text
    • http://kbfrutos.sk/images/_file/nonimalizovejiwuse.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/17222895109.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/cacfc1bd9f492e0fab7c5607519103a0/pibepelesagogegal.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/55972647835.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/wivitukalujufuse.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/92464447994.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/mizukutidobiwulazomune.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/58805824824.pdfIn PDF document text
    • http://come2menorca.com/images/file/67885894301.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/zepikoruxi.pdfIn PDF document text
    • https://rajaunited.com/contents/files/piwik.pdfIn PDF document text
    • http://qdcmd.com/data/files/82313948512.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/sugimajenosakesa.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/5e72a8389440a957f28f7b766151ba67/47137647513.pdfIn macro / runtime command snippet
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/585491b8166df529fd654cb12f15eec1/93458378303.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/37708325231.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/93837033180.pdfIn PDF document text
    • http://cistenivytahu.cz/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_off0000b8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DF 10568 bytes
SHA-256: 061cd9128c1e607db756b67ec20fcdbb1593afb81fe73fb8be498da4cb8d588c
font_02_sfnt_off0000e8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EC 17992 bytes
SHA-256: 2471e054e1be69ec3d90995965a5ac9f9db004bc34b64623142934dea1836ed3

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