Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96e42f7faadb7a3…

MALICIOUS

PDF

78.1 KB Created: 2021-09-17 22:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff3e99142834a4d4621cff172c423ce1 SHA-1: 169981377fb48cd1ecd0a72771045be7543959e4 SHA-256: b96e42f7faadb7a352152e469fccb73e2e8f78e6c6a17ba676d4f9afbfa1cf88
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly support this assessment. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a trojan or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/74055025307.pdf In PDF document text
    • https://wic-net.com/userfiles/file/21099191207.pdfIn PDF document text
    • http://allasclub.com/campannas/file/sofiverusimiw.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/97307499996.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/89694126758.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/fejelimiro.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/15680541006.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/xojipawu.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/zuzanibijupamixoge.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/5716765752.pdfIn PDF document text
    • https://harmony.im/userfiles/file/pudidonejizinuzotasasesub.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/61228931400.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/12894698617.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/berakate.pdfIn PDF document text
    • https://maria-galland.ru/files/file/vuradegapekare.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16130c425ac2cf---rawuzi.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27599111573.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/36056797225.pdfIn PDF document text
    • https://durimawar.com/contents/files/5999100376.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/88823172147.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141ba293a2f3---9056148939.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132764a7fd03---21504579938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=bisaya+words+starts+with+letter+uPDF 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_off0000c8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CE 10596 bytes
SHA-256: c2b1947b31ee5bb7020f3167cbd7e91051d009c468fea7630a50c9e49442a3c5
font_01_sfnt_off0000e13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13C 18452 bytes
SHA-256: 5c124e4a274992f83a7e75f4d017475330dcdd8ff11b542eeb00596394d249fa
font_02_sfnt_off00011101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11101 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1