Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa5480be323dba7…

MALICIOUS

PDF

86.6 KB Created: 2021-09-16 00:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a16649e3162fea24921ed9cdf86d472f SHA-1: 83b3d6c17e19d312ba2348d5ef0c3eabbe3de263 SHA-256: bfa5480be323dba785c58a6205ba2d8ec7a25d4f07e2abbd692ab8a4a8403ca2
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 critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420ad1a00a7---5352873176.pdf In PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/88750354039.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/9435949969.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/jatojonurugomavogoxu.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/93659823018.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dde9be54c3---94900464960.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/30162552038.pdfIn PDF document text
    • http://kurishupally.org/userfiles/file/lexugobivabevo.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/22059571478.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/74461245327.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/98c92d1c042a5adc3030b678ebd13074/33533125961.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/xiwelutimibuj.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/radurojuvalulisujireme.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613054dbed7a4---18006487359.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/89511591768.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/jodokagamad.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/60949654255.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/zaniputaxelakam.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/4888c4rn8d3eekrabe016sjgjo/rutemenojoronunuj.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210916_050104.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/74606263832.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/sabarixalefos.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/aa00bd1d872fd6e21866ee9123e30fee/magobojopanojujidobepemuj.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/799f35e37ba5ddf371ad7edbd4f24113/wadoned.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/77388507418.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/dubezokejebon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=attitude+indicator+app+androidPDF 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_off0000f023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001083a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083A 10376 bytes
SHA-256: e42de9025fbff714a22127bc6300171bcd47e998cc0c48eddeb5e0d7f56427af
font_02_sfnt_off00011fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCB 17476 bytes
SHA-256: 4fefe01415226c3b75085c58300eafa1de0a8c59ae3274719d9e13790d7b898a

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