Malicious PDF — malware analysis report

Static analysis result for SHA-256 327ed9f7e0ddc651…

MALICIOUS

PDF

77.9 KB Created: 2021-09-18 06:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 39c37254c915f6a62c3e5eed223c85c9 SHA-1: f3a36f43cdd2905e29cc8bb6687b033f28890b96 SHA-256: 327ed9f7e0ddc651019e2a4112254288eae79e0aefa0df5d723f2f307a30e954
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, with several URLs hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/68kulut2v5lmo2abfsu55uigc0/dikitejemijoderaxubari.pdf In PDF document text
    • https://ans5680.preneed91.com/upload/files/posimubimisanekejane.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350a7887a18---fuwumegebarobujekid.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210906220329_287944.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/15211029703.pdfIn PDF document text
    • http://kdekdyjak.cz/data/76520457208.pdfIn PDF document text
    • http://sakem.org/userfiles/files/60983296652.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/nuribewofejir.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/79572301831.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/doxukitukitiwa.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/zaxapibegibulusep.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/borurobiz.pdfIn PDF document text
    • http://planbmedia.hu/files/80061750308.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/b52cb57620c6d8fd852a51b5936a92b8/punolurarije.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/25738354503.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/mupalisujafexasuxumow.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/34341742652.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/pulutew.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sumopadinamujas.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c51e0343---65281149399.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/55725173801.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/filowutelixido.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/91521305025.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/fufopumagekofakuz.pdfIn PDF document text
    • http://sakem.org/userfiles/files/gefadufulemufo.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/bidojufipimozofepurilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=watch+online+movie+chal+mera+putt+2PDF 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_off0000ca36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA36 10752 bytes
SHA-256: 1d400f7e156eb5b0aafaba50fa5b9e14f2b2de7bf40341a328d4196383650f7b
font_01_sfnt_off0000e2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C4 17776 bytes
SHA-256: 763806401eae29294f734d9f809b3ca5fe98b9805b189d2d921252f0a00b78f4
font_02_sfnt_off000111e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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