Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6de7f28d792dc2…

MALICIOUS

PDF

100.2 KB Created: 2021-08-03 12:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 621737667df36b77474e6d1fd2857ec0 SHA-1: 221398b740591d3b075b3c8600755edbacfcfa12 SHA-256: 7a6de7f28d792dc265265a3967236de10efd1c63ffe3b8d86bcacc5f2c9ad934
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF files. This suggests the PDF is designed to redirect users to malicious content, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • 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 https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/9pg3qbci33beb1tp38sv0kjdn2/82182262943.pdf In PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607184d03e210---widutojofavi.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/5404247816.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/6b3ugfh3tkvej1q5hic2lr0bg6/69472394073.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/764ba2257b42b5027e7e087b1aa0bf0e/rawuxan.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160975ae452059---xirufugeziw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d85dfde842---vezajetuwupofuboxef.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/zeborotujufabetaroreg.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/jitevagizojaxa.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/tovobijeletixawamemuxi.pdfIn PDF document text
    • https://loctra.net/userfiles/file/xumipapovogokejerimif.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610066b58ad70---98811285138.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://sassyissy.com/survey/userfiles/files/30083838464.pdfIn PDF document text
    • https://area5srl.it/file/xukadokurokeberujaniranuw.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/xelisoromafup.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/14061b6d34920b1adee38cbf2b18573c/12087002003.pdfIn PDF document text
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/pokusepimakupevudoz.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/29492890268.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/13df511e8d40e863f28469504cd03ed5/sukemozaxowe.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/b6307b3b33d06ff99af944986a1276a0/86740795128.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/kogotokidujozawemibogul.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/menelebimalenenagave.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/sogakuvawemax.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/netajoq4okfhrc0eoceh3k4ap5/34974853843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=diane+schuler+crash+locationPDF 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_off0001208f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208F 18736 bytes
SHA-256: 6d60a41b9609900b5f0d6c52aef3e3f99f62df7adbb5a004b7a9ff069604dd89
font_01_sfnt_off000150c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000168db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168DB 10428 bytes
SHA-256: 6e0927fe3d021f1e322f71fb277d2c17ab4a93d7156e62c7164227c4a18b4577

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