Malicious PDF — malware analysis report

Static analysis result for SHA-256 129372ff0d977b2a…

MALICIOUS

PDF

77.8 KB Created: 2021-09-18 08:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 202e89b90c1c9533fbca96662b8088a5 SHA-1: 07a071f462f594e1803558990e7b9f1c19962333 SHA-256: 129372ff0d977b2a59d71581103c0f25497e971b0a7e6a9bd8f85537c2ff22d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. Several URLs were extracted, some pointing to compromised CMS uploads and link farms, indicating a potential phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • 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://mamadona.ru/ckfinder/userfiles/files/96906389513.pdf In PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/34804861515.pdfIn PDF document text
    • https://casaalu.com/luutru/files/makupifejidujelolinurezel.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/5588997892.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/fulesabedanebaluwijit.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/27212151007.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16144a14292677---levezasazonin.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/79921372599.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/20039508661.pdfIn PDF document text
    • https://haidangpc.com/contents/files/12009854244.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///mojiganomoradego.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/jawimumurabe.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/tunivikirage.pdfIn PDF document text
    • http://africareview.in/userfiles/file/somab.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/zezomenisavuv.pdfIn PDF document text
    • http://zimmerei-possert.at/bugojuvo.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/40700285637.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/94355527214.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b24f56423---8967252162.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/15018997693.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/wufeziwodigowetowaz.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/xarajujo.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141f0e88c135---73904616569.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/tejexolapipumixigini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=orientation+to+the+counseling+profession+pdfPDF 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_off0000ca9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B0 17628 bytes
SHA-256: 72d9335a8b929531166828ed32a54850fa6c26b6dfd8f285ed2c7acb74d42d24
font_02_sfnt_off0001104b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104B 11024 bytes
SHA-256: 39b1005355d79646f68a2b1b73ea95507d5540e462f7dbe05c6ca9ca8e750e63

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