Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b1b9936e0bfe7d…

MALICIOUS

PDF

76.5 KB Created: 2021-09-02 13:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 90fc23f425bd1316e2be6317907b1005 SHA-1: 3e0bbeacb8146ac6d33585a75d0a934ca31f825b SHA-256: 82b1b9936e0bfe7d2908cb113467dcca5184f7448c8fbe3242631a4d7062eb1b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content. The presence of 'cmdmsnbgii8qlkmnv0/xefugogat.pdf' within the document text indicates potential command execution or a reference to a malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714752a2412---80187776837.pdf In PDF document text
    • http://le-bouquet.be/userfiles/files/75998798642.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021080812530773499.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/42574388725.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/xovibevonutar.pdfIn PDF document text
    • https://mytopics.it/uploads/file/zumezupires.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/e50e0e4fc38b0f9279a1618c6cb3f171/jisujimomuxilufulozoladi.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/2721082089.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/bafulaniv.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7d2706bb6---keginaga.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/kivivakow.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/44d5d0bbc39eccd9d358b055d34cdc44/32379664739.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/62893115544.pdfIn PDF document text
    • https://wagaskar.com/media/37106108067.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/muwukodoromaxutedusubuda.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/a42ahjdr1ogp6a5nnl1iaao3a9/juginefusepuzurafugisu.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/jfqpuf2scmdmsnbgii8qlkmnv0/xefugogat.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/81612302343.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/jepurunajakogis.pdfIn macro / runtime command snippet
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/bcf0872b13fbcd3c7fa1956cddace362/88806840301.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078204b907cf---tibejopixivuwawakeniba.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/pefedujofogefukamefa.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/71ffcb557b4d034ec9e25038a8b8a4b8/23763611496.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/fuviguguvesiwixi.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d67d21296c2cfbb9556a47ffdbe277b2/nibozadeg.pdfIn PDF document text
    • http://canevinclassof70.comIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=rubeola+en+el+embarazo+pdf+2017PDF 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_off0000c277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC277 18368 bytes
SHA-256: d0567f89d8477161a18090d3ba711a34165360300b09ac4db6d041707c2592a2
font_01_sfnt_off0000f183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001099a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099A 10992 bytes
SHA-256: 82b34498633d16f17cd075860be987863a5e030c9318b2cb550918888f411774

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