Malicious PDF — malware analysis report

Static analysis result for SHA-256 878ba16e631095f9…

MALICIOUS

PDF

69.1 KB Created: 2021-09-29 13:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e0ba316abf4dfc602ab538bd5811a957 SHA-1: cd71188a224fd9b4ee4238b4e03468937002877c SHA-256: 878ba16e631095f95bdb31e151fba0dd24a2f0f6311c59ecbf70d793d177f6dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on compromised websites. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://czernavendeghaz.hu/admin1/file/63522257072.pdf In PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/c85cd4bde77562fa2c5c43754dba20ea/kirutibumutuxuj.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/gutowor.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16149420787558---puwawali.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/radux.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/wodojuxiju.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/f30883cdfcf17d9210289172ceb5ddb0/1960677945.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/noforuf.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/zibakawegazekumulu.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161383752777a1---95728610463.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/kiwovasujopeka.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/56901139159.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/afqf8ftoothdjic1b0ko8isd42/lodulogikapixujamefosin.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/35264512939.pdfIn PDF document text
    • http://konberdbio.com/upload/files/pomesopujexoxanuruj.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/10194053637.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/sikujod.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/14695918019.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/65894716797.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021925232333797.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161523d1162aa7---tulijum.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/wojeriwogufaxozivajewifa.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210925131148.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/mufovuroduju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+delete+games+on+your+phonePDF 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_off0000aec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC8 14624 bytes
SHA-256: c7359500236e9e8ff2fe1272040710c6dbdcfa2006ca5f22205c04982402aff0
font_01_sfnt_off0000d3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD7 11036 bytes
SHA-256: 048247c42502a015bc654a3ca0f3343660d0873c72f1f930789ae1238fb23d9b

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