Malicious PDF — malware analysis report

Static analysis result for SHA-256 316585dfa5be68a5…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 21:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 371d3a47648e8ac1a8a1890de7cf7c68 SHA-1: 17c1b3bd2d95e8278e63e177eefc6c949e68f547 SHA-256: 316585dfa5be68a54baeb58adf4ac05e13ffb8c0af4da365110f99d8c481d53c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous disposable domains and compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and numerous external links are consistent with a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://kligi.viart.lt/ckfinder/userfiles/files/14450308131.pdf In PDF document text
    • https://lotusmarinevn.com/upload/files/raxotelobonuloxufodusuzo.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/rewarusogitiwudet.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/53574728928.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/rafolovugavojinu.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/6857074907.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/jaxajusagefu.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c5aae9f95---91150121617.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3611a8e8c---jojidasufi.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210917_CD69EC8B101494BD.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/kagidobidam.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210913011402.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/wutupir.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/8940478541.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/nemon.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/gatomevolopamu.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/1102634211.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161321cbed5d59---98781851897.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613180bbe8f75---kilegonisuru.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/tudotusuxawaruduvoloxaru.pdfIn PDF document text
    • http://meditopthailand.com/file/73364520852.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/4dab80c9bf0dc477541379058b0a33da/7258176084.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+upload+pictures+from+android+to+laptopPDF 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_off0000d700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD700 10956 bytes
SHA-256: 216db1a12337f4af11ea462b33bd9a5f21a3b81f6257dd2dc6148c7b6cb4f5b3
font_01_sfnt_off0000f069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF069 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001087b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087B 17992 bytes
SHA-256: e39691cddebbc97ac4251ce88784c43775d7f4c106f9dbb0a7580b4a320d0abe