Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88945cbdd14210c…

MALICIOUS

PDF

69.5 KB Created: 2021-09-20 02:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 617423e50a1881822e49dba0e25c930c SHA-1: 3d0dcdcbc2e82c1de7e8e1ed0af9a8b44f2f23c2 SHA-256: a88945cbdd14210c7d6edb5bae696162e26a3deb7dfc19caccb9144a0d154ed4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are common in phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.huescalamagiaenfotos.com/userfiles/files/nezakowalurowemuwuwubiv.pdf In PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/zibusudivugosirisapapo.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335fd8e76b3---webumozusovorute.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/gorukeko.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/sulegugaxorogosuf.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/jijepoj.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/wiwirulovijepexawiloxad.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/gevipalenizegegajivape.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/44100429087.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/55ae21113d1ecc5ba450ad277f14a808/71703005554.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/xinovowolomebofuvebot.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210903140105_npdxbu.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/nonegokexubuwonezurolowus.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/bdf849a0f4d95b88bfaa5b47b3dbf1c2/gumofotufef.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/32207473591.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/towugadus.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/dedojagezusowevikej.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/wamokodirali.pdfIn PDF document text
    • https://sitarasign.ir/data/file/64088668536.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/lanirazusulasaruwew.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/sojaluxuvixazufumuzadak.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/78703710174.pdfIn PDF document text
    • http://js-space.de/userfiles/file/katosixesenibik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=d+things+that+start+withPDF 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_off0000b326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB326 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB38 15472 bytes
SHA-256: c7117ef970565e27d5bae6bf17189f6ba84c1ef98f2ce17e79eee69f2379a20e
font_02_sfnt_off0000f1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AD 10176 bytes
SHA-256: 7a9545dea58292cb03f7151c4e8f915322f3817948f3d3a4c67c76b1c4501e1f

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