Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d7c4889c0e6b36…

MALICIOUS

PDF

70.5 KB Created: 2021-09-09 04:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 962a463b2a29e9dd2a159ac91fdb856a SHA-1: 3cb683ce9e9e4b9a5f39c2d3ec39bb9a57d0045b SHA-256: 91d7c4889c0e6b3648c63afbfa5c8a888744c44693927a07706951279f8d4c35
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' reinforces the conclusion that this document is part of a malicious campaign.

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://dinskayarealty.ru/media/file/furir.pdf In PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/96cc5c5022d5b8aab1be48523b963390/jiwufibuturaravonigoxiso.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/gevokexoriwugadaton.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/zusufarafusow.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/lerikoxineruzovomoso.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/toxobijopobenibadunoxof.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/29330358364.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/rapugiju.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/xulajusututanobabenedoz.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/597976d7ede7409a859dee822f1bc529/53927366405.pdfIn PDF document text
    • http://emannsltd.com/userfiles/82343452782.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135082c9e8cb---zadeviviwatuwu.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/7494038d05039d83e79efdbc575aec88/72001919133.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/kajogedifutamiberexokubup.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/54e59cc4b69accf4f6dcd92a2a224b9f/42793623511.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/51829367129.pdfIn PDF document text
    • http://indel.sk/userfiles/file/82541811081.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecf81af907---15353554130.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/dapoberemominibugiwo.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/64513895353.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/mav0jr4irgg938gve97asq3a1b/21773905273.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/xogixijopozitewewem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=naruto+shippuden+402PDF 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_off0000b2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C6 10840 bytes
SHA-256: 47dd429b5e39fe1c6db8845d595e433b07727eb51a8790473165ef426361e273
font_01_sfnt_off0000cbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD4 15808 bytes
SHA-256: 8abcf2714621d14cdb4a23a42052e981a9efd8403a90483e371653659a0043b5
font_02_sfnt_off0000f485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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