Malicious PDF — malware analysis report

Static analysis result for SHA-256 03aa4a716b902787…

MALICIOUS

PDF

81.9 KB Created: 2021-10-14 17:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 672b26e5d0e966ae65e1c022e385e3b0 SHA-1: 783485911011ea0aa762840b9d26e7f26f01a2bd SHA-256: 03aa4a716b9027879094c439a148a262f2b56e1c3f3ff8f7ea66769b9ef50876
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are common in spearphishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://oniceh.ru/uplcv?utm_term=necrosis+on+foot PDF link annotation
    • http://nfc.soo.jp/file/femedasedujufixi.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/funopodugonigurixop.pdfIn PDF document text
    • https://intersat.lv/files/file/namasepitufude.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/jerujiridat.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/30710773036.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/68978980704.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/c6e820582d59b615293a81b86a42b930/18521333264.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/8589764851.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/bipola.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/88513027065.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/16010032651.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/77596302976.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/34701941850.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/13593642765.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/11728965606.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/53438625151.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d176420f99---lokomibelikofojov.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/39407611881.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/64402257634.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/zozise.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/lobavi.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/51907928804.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20211011_8330EDEFF2D82DE8.pdfIn PDF document text
    • http://tfforming.ru/d/files/gisubogiwoxevupalape.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16165e281b7f5b---zajumoger.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/52638352231.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_off0000e002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE002 16736 bytes
SHA-256: 8c81a32fff4549a4c0e23dc7c79050ed1148f06a333597fdf86d94abe8b49fa1
font_01_sfnt_off00010b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B02 10100 bytes
SHA-256: 26885bc3bc4e7e36c87d17e173a58d1c2b940a08fa10a91cacf3201b7fc34b18
font_02_sfnt_off000121ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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