Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc3467d6e85c866d…

MALICIOUS

PDF

85.2 KB Created: 2021-09-07 03:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a2acb8f2c454595682ccd49e70859b76 SHA-1: 2a015cb0035397e2362e0b72dbad4aef24b15125 SHA-256: bc3467d6e85c866dc047f29d354fa377bf82258d5a05bee2f1ed0c7dcd2c5a30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1003866755610a635456e23.pdf In PDF document text
    • http://tw-sincere.com/upfiles/editor/files/84800132298.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/5bf9f6c5a0efeb52d2d01d9fe3478c00/82314925728.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba13df9a4e1---nejenekadakonosadi.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ab2605806---tepafebikiwiraxu.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fda4b6deac1---78823418700.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/59791288233.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e020cd55fd---tipakafafaxu.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/99218838427.pdfIn PDF document text
    • http://runhouchem.com/upload/files/jitolosatox.pdfIn PDF document text
    • https://airshow-bg.com/file/ruleredoremetuwov.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/89845662526.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/selobinuzokedi.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210714102854.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c696f9be8cf---gudubudotusimaravapibegu.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82d9c8b99---72387603603.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/12898703464.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/91936831559.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/cff4aae2c1d367d399d824f108ab67a4/dubedopovarazum.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a4d7b2e25---bufazuzevogirevil.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/33599319918.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/7b139c13eb33d509fb24c4a7eb23767c/3571693724.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/9ec19e1a9ca1e64788b1fbc661ebea87/47132977412.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/zitojiwowinasaxulesi.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/51948627346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=solving+equations+with+grouping+symbols+pdfPDF 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_off0000e346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE346 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 11672 bytes
SHA-256: 1774fdc2a0e191dd10e36b1a7a0ef0af1fe60423aa231bf12b8338f21b966fb7
font_02_sfnt_off00011647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11647 18988 bytes
SHA-256: 03cfd69d5cdb7c6476e8979d053e534e14daa0017076ca37a26178cdcafbf580

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