Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f94b5cbcece2f3f…

MALICIOUS

PDF

77.5 KB Created: 2021-09-16 06:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f12814dbff70448486d73541ee3759a9 SHA-1: 982aa5b665da95fdb823bba148c3f85717c2893c SHA-256: 1f94b5cbcece2f3ff57b752c55500496e54e4dd58e7ffd6532722743673db06d
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links, many pointing to potentially compromised websites or disposable hosting, characteristic of a link farm used to distribute malware or conduct phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://verypool.cn/images/upload/File/gebukimomi.pdf In PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136fdafe8757---12170278461.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/rusotumifozuxanadubiz.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/jidukegejojapiduga.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/47961208764.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/21588698763.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/regunowisobo.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/add734c456cf3007a8516e90b8733b89/jamamagujoxebo.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/xibenawopebifetinap.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/sejowofamesokotukef.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/8296166571.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/63269778593.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139ead834ed7---lasejigamujeridipozirewik.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/89247920804.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/kilajulivazasazudi.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/jejuxutetewusas.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/a9f13f3cf0686e337dde81a7d840ca77/93492658787.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/sonafuwisopudewenuf.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/rigixoguku.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/92020308542.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd7702d62e---debaxuwilagixofedelib.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/wudavobolud.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/74881116716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+walking+dead+game+iphonePDF 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_off0000ca7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7F 17892 bytes
SHA-256: da9b802222789483784b66f6bc3e9e40d19a8729edd1bc91ec8b1f90b04e9932
font_01_sfnt_off0000f864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001107b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107B 10616 bytes
SHA-256: a49809c452827e70d4b218617dd9848147f04c85f76f98968f83739011dda541

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