Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d29148cf61826cd…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 04:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d552efe16b018f07285a53ed2e1d5f12 SHA-1: 4e5ce84d55da9cdaed08ac9a3d58c17744de7025 SHA-256: 7d29148cf61826cd4127a181d7508e08bd92ee48fe3038d486d3f50893b5fd8c
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links, with several pointing to PDFs hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded JS and external links suggests an attempt to download and execute further malicious content or redirect the user to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135b12d6d5a7---weduzopivegibukudezupo.pdf In PDF document text
    • http://studioego.cz/userfiles/file/zifezegom.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/nitawozudizuvowevuwo.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/10336919601.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109111354388132.pdfIn PDF document text
    • http://attlas.center/userfiles/file/7129880994.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/repodewenex.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/nijerajipuvatufazolidew.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/26838559193.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/rufilix.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/kigijeripexugemifasokel.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/23389196621.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/99925689427.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/85877236205.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/3429799228.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/3899cbe2ab9d477a82e72e4e893d07eb/37562472625.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/bewilorub.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/32128948561.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/18435097806.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/xujaligopasojasiped.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/46275488737.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/99671565118.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/8r7jdm9jsjb881q3r97s5qo6k7/16976964005.pdfIn PDF document text
    • http://istocdukkan.com/userfiles/files/18653297143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+use+a+qr+code+on+an+android+phonePDF 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_off0000dbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFD 17500 bytes
SHA-256: 14793ee3511eb32ca4f0b76a013d1436b776e93f9a22ebc45875233ba8a815b7
font_01_sfnt_off0001095c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095C 10888 bytes
SHA-256: 06be283bcf79e385415075a773cd1e5d751a729288f2e1037c6bdc5363e30b3e
font_02_sfnt_off0001224f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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