Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b7f4c62a25032b…

MALICIOUS

PDF

72.6 KB Created: 2021-09-17 06:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b62e014cb74879ae3a39bf62deddaaf4 SHA-1: 89fd32a84eca38130906d7563319d16343a1ec14 SHA-256: 37b7f4c62a25032bf7bda596dc3e427c54be83d593d600dd4c480e797dfd577d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. No scripts were extracted from this sample, but the presence of a link farm and the overall structure strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://medvor.ru/uplcv?utm_term=how+to+boost+up+mobile+data+speed PDF link annotation
    • https://jackinthegym.com/uploads/files/202109071201206065.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/78750029542.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/kinetefavezegevovas.pdfIn PDF document text
    • http://strandedtattoo.net/file/49224903456.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/44528091959.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613677c629078---mofevob.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/46843084039.pdfIn PDF document text
    • https://asiahealth.standrewsdentalsurgeons.com/ckfinder/userfiles/files/tebila.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/darenisotuz.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/d5e6f671ca1a189c405a8eb417b048a5/44462907588.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/manipepaku.pdfIn PDF document text
    • http://intersonik.eu/upload/files/2794947164.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/90540988432.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16135c48348184---vavutudubatafixoj.pdfIn PDF document text
    • https://migger.dk/userimages/file/rezokejazevalimisep.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/86548589109.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/kopovaj.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/nupamejeb.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/83900832830.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/litev.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/32099589548.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/75635353004.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/tabotabotazudogagebupava.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/garewinufezovaken.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/35178158240.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/xedudovejituwume.pdfIn PDF document text
    • 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_off0000bc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC33 15480 bytes
SHA-256: 70efd6957a281eeb65f4deb919ac14619dfafdb4ae110a4d7aa9f7252194408a
font_01_sfnt_off0000e3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A7 10668 bytes
SHA-256: 0cae71b2aab6e69ef49768829203a360357e7ebd6a9618d3794d6a9c6b964d10
font_02_sfnt_off0000fbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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