Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7ce67cd86630f3…

MALICIOUS

PDF

138.8 KB Created: 2021-08-04 04:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 03688e262959eb8a3ed457eb7ac4e8c9 SHA-1: 0d70b524be53a7907b53db34424d598ec2f5e8d6 SHA-256: be7ce67cd86630f327c4801baa61ab14dd2a8f83edab6dea8c8f304316b786a4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The heuristics indicate that the PDF acts as a link farm, pointing to numerous distinct hosts, some of which are compromised CMS uploads. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://drapikowski.pl/uploaded/fck_files/file/sukanokotis.pdf In PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e24d9717389---30437145066.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/vilubunakutemivijuko.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76d82cceda---26467151714.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4d5586503888bbbd819cbc5a7355fa0d/sugixuz.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/43645840822.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdb576ccd5---pofitivibazila.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607e752ef0e1d---didebunupazuxu.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9402e118b---fakimu.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/1ab4242f394bfbcdec099037979800cf/bipubirig.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/472c7a32f3022a14aaa179444411c959/vovimiwadixizafila.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/cde56c6036aa8536892914f1f71f38a7/14876129756.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d205bc8756---gesikaj.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/62645147695.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86e627e7d1---fekuwimitijomi.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fcbe818c558---26581731974.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/xitotekubujopodizimowipim.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/shbm4dvnhntv0v5p0sn659qa52/64979507825.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/70af58e46e2e5f7f82e6a4efee708a96/fuvafoziv.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608068b3c2464---60836321259.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/3031021227.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/50436307345.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083363c44784---limokajoguxit.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/rutoboguzadinosewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=error+la+celda+en+evaluacion+contiene+una+constantePDF 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_off0001b6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6B3 10512 bytes
SHA-256: ec423109d679b38f200f193cd6143467f8348143c222539431e8dd45bf0d60ea
font_01_sfnt_off0001cebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CEBC 20108 bytes
SHA-256: 8627f5891b530d13fd11a02b8f92e84124933688dcdd2d2293e41cb870efd1ac
font_02_sfnt_off00020275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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