Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc79dc0065bdb368…

MALICIOUS

PDF

90.9 KB Created: 2021-09-19 21:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 450167f13dff2cd10df23ee9cc4e8b3e SHA-1: 80f53145ee2ab91db23ad578741e3750c604e843 SHA-256: cc79dc0065bdb36812d8846ddacb0634d2a253d7796e6fabfbc99f3eb74af1fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to external sites, some hosted on compromised CMS uploads. This suggests the PDF is likely a lure to direct users to malicious or phishing content, potentially as part of a broader phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/97893844650.pdf In PDF document text
    • http://taiwan-tsai.com/upload/files/fazupunoxudamokefurit.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138f49788307---kozesigefituponejina.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/tivudarazesexapakigebuzo.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/satakiwamodipasoga.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-19/20210919015058630552.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/49856021874.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/88272351045.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370f1c04a22---26069603138.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/jugekomujizowivokanetefil.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/18ipkngcv4l4q2273ontrb6a42/togituzon.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/84906132305.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/tazorevedonenatoj.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebe7a3554e---zujewupexudexufujefuv.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/selagosurenebabivejob.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/satikulogukumavu.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/pukemeta.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/josekuret.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/duwopuk.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/majotonepefarolidopot.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/balepemasilexeji.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/tiwola.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210902195929.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/vutabolakesagib.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/70661222108.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1631082432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=juegos+parecidos+a+pokemon+para+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_off0000fa11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11228 10896 bytes
SHA-256: 298a3275704f1d32a690a89aa027a105b185083c8a7483aa94f72b89f6440b8d
font_02_sfnt_off00012b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B29 19592 bytes
SHA-256: e062b9080d9ea6fe3815a3350bba213f83ef8549af0b90cbd23274ccd01f0ef7

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