Malicious PDF — malware analysis report

Static analysis result for SHA-256 dab88a5c261b47b6…

MALICIOUS

PDF

71.4 KB Created: 2021-09-29 01:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cb690704ca93a545e16eb56c0a3da009 SHA-1: c48fa959085ff918f324c8aec691fcbb0ab6f1f1 SHA-256: dab88a5c261b47b60e2726d76a1d18421d585512aca13c5086e65c26de8f2348
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress uploads, further supports a phishing or malware distribution attack pattern. The primary IOCs are the various URLs found within the document, which likely serve as redirection points.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 http://geerhannutpourreussir.be/docs/upload/files/vowumuguwujamifa.pdf In PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/52884527329.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148066f26d47---14766826028.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/sixajaluravapumowis.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/zevawu.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/fexowixupumag.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/97713055102.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/11763852520.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/kolomutekopaxepabav.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/zibexesipudalise.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/ruvugedikafadapigeje.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/ranedez.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/59235355149.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/0dac88b79db213f9018a5f474cc7983e/jivadisedigisonunirigisu.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/jejipo.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614408ed0040a---rakivokazu.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/78088149321.pdfIn PDF document text
    • http://taxfreepoint.com/file/kivozunamugobixofitikafor.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/bidovatorurunagivorusaji.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/50820137744.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210922190412.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/53c8d5d2685b58add33d86888a1dd39e/xotetobukiwi.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/foriroduwapivubagije.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/nogowevimozuwom.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210919033450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=cast+on+mobile+chromePDF 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_off0000b682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE94 16272 bytes
SHA-256: c175287d89d2e1eb1ab111618bbab50e434e1debb153ad9b868333685ebda129
font_02_sfnt_off0000f7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A5 10668 bytes
SHA-256: b212f67b2f0d49a44f1be053cf23b9e6e64afb367c0f2d87f6b29061c89f0e17

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