Malicious PDF — malware analysis report

Static analysis result for SHA-256 af97b40b268af7cc…

MALICIOUS

PDF

85.8 KB Created: 2021-09-01 22:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 60b8a1374b21c6a6940eb565a5a8a6e3 SHA-1: 9743ac87f03bf69d70ea5ca918f43bd4eff2d2e0 SHA-256: af97b40b268af7cc403d5b52ecd7c352b384f56d2e26d5be5d979410fa55cc58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://cropscipublisher.com/files/upfiles/file/91670018460.pdf In PDF document text
    • http://sequirk.ie/userfiles/file/zewaxunezukiwu.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/votaxime.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/led20apm736pee5fu5bghga3am/davimadinirelir.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/20528826046.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/78567354383.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/157ce1a9b6f2b10eb6c2c3b0fdedfbc0/45623956317.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/689cd261322a0350d93440c6692561d7/21551280048.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73a1f858d4---69906949098.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/78001116214.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/fcf78a2f432d65f2a436efc7c31fa689/fufafoduwitipisus.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160868e34a10de---41591334502.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6907d151a2---49667326350.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/11793261502.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/c624b1a0f12a842940ffa83f41fcbe7a/webapadujurenidalefasidu.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/gipuvidulikewotex.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/93881595704.pdfIn PDF document text
    • https://whitesal.com/data/images/file/3869_20210705145549.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/rejoxoribev.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/900e7d7cc74ecbaa9d2ea7a8c55a3047/zaxuzemugutudutinuviduwaz.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/wowepiguzav.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/98837059236.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/5434593911.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/xuloduvidarejovi.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdb5ec0b25---zomunefuliramifanunofikaz.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/38193257766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=words+with+q+and+y+no+uPDF 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_off0000df46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF46 10608 bytes
SHA-256: 9bbeba3be7bda455be7596bf0182da027aeed1c21e6204191264267c2c132188
font_01_sfnt_off0000f74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74C 22196 bytes
SHA-256: f5d955bc1aebb3547e22fbe42b363496f588d113fe57a38224ef35beefbe682b
font_02_sfnt_off00013142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1