Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f7575ba6d2238e…

MALICIOUS

PDF

90.5 KB Created: 2021-07-14 09:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 282e13f5291a371ddacf6364cab01585 SHA-1: a88fbd0a5c2279127af60806177a17cdb5b9bef2 SHA-256: 37f7575ba6d2238e368908a385b3b7aab9dec73c8d14ba08ae64dd29f93d467d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of 'cmd' tokens in the document text suggests an attempt to execute commands, although no specific script was extracted to detail this further.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://lukasikgroup.pl/Image/files/kojaretisinenigiluvo.pdf In PDF document text
    • https://batikatravels.com/userfiles/file/lumomuxikanofesinujedot.pdfIn PDF document text
    • https://rotitelor.com/contents//files/bomakanopakemegefepas.pdfIn PDF document text
    • http://51www.org/uploadfile/file/839dd8da1120e1495425e67918da51ec.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/a8ad6fbc0b8a4959976ed07ed2dc270a/ropojidabiladerukole.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/noboxunawatizetuxijivo.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/52181a0b926b632f443211df41608227/53369377807.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3bfaf53630---wulowusofotajanisalot.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7ff85irnogig4v0dceuepb5od6/29174609447.pdfIn PDF document text
    • http://shsclassof1970.org/clients/872719/File/mezadifurexasokufe.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987918635d0---26612250620.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/8eb408980d1afe81c836870cb3343c90/bikefipazokixutekop.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5b7b44216---wutogaxekawafopofekatado.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/50553826999.pdfIn PDF document text
    • https://rcot.org/userfiles/file/bedenivar.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/goxivojawazamikajixefe.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/e005bc27d2ea5fb4d7b030297fe13cb9/bajedoz.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/0eqcmd5kprr2tv7d2c0lu39qtk/jimuwim.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e825e179b---70391382544.pdfIn PDF document text
    • https://vieclamkinhdoanh247.com/upload/files/39948596196.pdfIn macro / runtime command snippet
    • https://citytrafik.nu/images/file/wolegevisomijakebimabupu.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210707/210707232801445370bgma44o77p47.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/98431798830.pdfIn PDF document text
    • https://www.modianodesigIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=clogged+nose+and+sore+throatPDF 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
    • 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_off0001015c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015C 10468 bytes
SHA-256: 0aeed942f660bc566e9cc4819c52faddd57a1f0614d525a8cd98e18272f2c416
font_01_sfnt_off000118e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E7 16832 bytes
SHA-256: 19e9f38a5850240c031e8ebc51d9ef8241775c501cc6872cc6b8e06d3ee03c99
font_02_sfnt_off000144b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1