Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd1314c92253004…

MALICIOUS

PDF

79.1 KB Created: 2021-09-01 20:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5331174013ef43a530101fa533af1c77 SHA-1: 57d67274258a3f6cc3b28bbc70043c43b637a72f SHA-256: 9fd1314c922530046b840e539e6b3b99302185210ec8d70eb7338fb899bf8bc7
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The embedded URLs, while some are marked benign, are part of a larger pattern of potentially harmful redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f12a59ab3b2---62967928083.pdf In PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/607c078a7787515c6daca647717d70ea/pipizunisejokolexejanev.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/88111215901.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4931c2227---20082393385.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/440da9f43ecec79eba99cb4be6a87b4a/31396349421.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/dopavonidamuzaba.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/bawedeworifulumobisorova.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767aff9beb0---sobiz.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/e9838a6c9ba18e22788868b3bca3c4d9/nakogowitamipefimaxil.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1ae341b70---7801577939.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/86282025346.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/67e543761c15aa8467e61f3d8b143abf/37120486762.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/3ba47ff9566c257457ce49327d4a910c/sesolojarenujugufusus.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/36821734687.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b3bf4b790---pinagojosaj.pdfIn PDF document text
    • http://maytinhgth.com/userfiles/file/38028679719.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/43222900617.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/cicshb17ad5unuu4cvbsptmm8i/lobakokipajuwadujorepakop.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/qtvri8vjk288rqhfmtvds29hpv/lesuxolokixarerer.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/52560792402.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/64017189654.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/xafavibikara.pdfIn PDF document text
    • http://wwstationery.com/files/file/64458614263.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/49108980410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=during+endotracheal+intubationPDF 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_off0000d1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D2 10720 bytes
SHA-256: 0f2f9d1c68e48e6b37fe3fa707fba3d52211698c7b010791d2daa523db388810
font_01_sfnt_off0000ea17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA17 16760 bytes
SHA-256: 2cb2d051ead824a7715624658fb57bac793545ed23e04d1ed1155ca05406d809
font_02_sfnt_off00011587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11587 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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