Malicious PDF — malware analysis report

Static analysis result for SHA-256 683b7bcc64d0f274…

MALICIOUS

PDF

80.3 KB Created: 2021-09-13 03:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 11f301e505b4a946f29e102f209b41bb SHA-1: 8822006ee30106008508f09bdfd45d30e4f687b1 SHA-256: 683b7bcc64d0f274208f6e980d2e78ffb8f20063a19ed86db5cdb3b37d93d814
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains a link farm hosted on compromised WordPress upload storage, suggesting an attempt to distribute malicious files. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution scheme disguised as a software download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/b4904610add75dfea20c540adda1396c/solafojovojoruvisajulajap.pdf In PDF document text
    • https://petikdaun.com/contents/files/fadaxevagovunerutozit.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/lowoxesube.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/4754844892.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/nodebuzevonuviru.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/79248477169.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/17806830065.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/81378873319.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/87360297011.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/wesalulaviramaxevuf.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/40943507947.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/wegujituwemafekugapeneji.pdfIn PDF document text
    • https://value.ae/userfiles/file/9809381298.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/16533027353.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/26657114559.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613001d816d9e---busulubeb.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/55330498837.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/89836972136.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/fenakefidewenetubu.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/xibikelejinuli.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/vejikirurimutuma.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/lesozalos.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/fumunubu.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eef6fe7b40---65796832706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=windows+7+ultimate+setup+downloadPDF 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_off0000d886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD886 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF098 16524 bytes
SHA-256: fea431f5b98085b80105c7e3c70a298df23dc57d8d6547aa7e529735066c9f25
font_02_sfnt_off00011b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B15 10680 bytes
SHA-256: a3278a430e4ff248158199654c82976da259178978107bfd3216178899227be4

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