Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad6c0e415f808e4…

MALICIOUS

PDF

99.6 KB Created: 2021-09-22 13:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2a74ba193578ec89091bea98aa339d20 SHA-1: 3872eee972166d31b01908e3040b29797fe24213 SHA-256: cad6c0e415f808e422630219a0f3284003c6a97dff57d3333190483229330b6a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to external PDF files hosted on various domains, indicating a link farm. Several heuristics, including 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM', confirm this behavior. The presence of a raw IP address in one of the URIs and the ML classifier flagging the document as malicious further support its suspicious nature. The primary goal appears to be directing users to other malicious or compromised sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://bokaichenyu.com/upload/files/jewave.pdf In PDF document text
    • http://norilskgu.ru/userfiles/file/78947885385.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/venusigabigekinu.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/89374987268.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8b72e9d4c---46902934606.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/mowobujiwoxilo.pdfPDF link annotation
    • http://yuc-fac.com/uploadfiles/20210905062016.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/ludoxakolajomav.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/kamojipedod.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/8510671701.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142506d83157---bosanabet.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/kisakojupubiv.pdfIn PDF document text
    • http://fteq.ru/files/file/dimenajesitajape.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/mijijoxefa.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/16681415918.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/45968714339.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3b5dd39811d1e24f7884e589207f4b86/94662035407.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5cd789182---mogipukapudepewevuda.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/kiranizaranofa.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329d0337701---14487689298.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210917100010.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/i8hq8is1bq1a7kknlpn501l9u5/15899512906.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/lexexo.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/nefadumabejuwikovanijizex.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141126deac09---wusitatu.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/ponenobadepewomokimaruw.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/29675763955.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/0b79d9e48bf47e701345b1b84f151e8a/vunatonugokedelerujanerit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=demon+slayer+vol+1+pdf+free+downloadPDF 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_off00011c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6C 19456 bytes
SHA-256: 27fc0fc345887525a165cec3c8a08788982459f16e3e3c7b09bdd983f7608be4
font_01_sfnt_off00014f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16719 10788 bytes
SHA-256: af7965352ecdc2e4756ee6f535a26a04d42f5efebc2589d862c74a725337012e

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