Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7484257ebdc13a…

MALICIOUS

PDF

83.3 KB Created: 2021-09-05 02:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ecd7b37adde787172414b8cedddaf40f SHA-1: 46a96404ea8b70fa989b845b1152f05d09439be3 SHA-256: cd7484257ebdc13a18a8561bc4ec25a65ae6350c6b21b11d9b8d27528266ca52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the nature of the links and the heuristic firings point towards an attempt to exploit user interaction via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://haciendaloscipreses.cl/upload/file/takezojixodi.pdf In PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/1536768006.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/26588930534.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/1145876291.pdfIn PDF document text
    • https://baongochoa.com/upload/file/nomadudanafuwo.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/462ff36ffb181f6ec7be468d099775c2/mapiwemogetot.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161216299b0038---79251154743.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/56775609490.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/29352628954.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/g1d1ok2dh7ieagdn90ai9tf303/lodisaruroralifesokojetu.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/0em4k4gbban25tl5c43su605c3/44077578797.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/14076427369.pdfIn PDF document text
    • http://rideco.hu/upload/file/46256454887.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e312598c2e1---74264153905.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/7gib64v9q0caj7827699hgq4m5/labivuked.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/87118829139.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/lnqaald51cfaes0on5ta2kbpat/16428910554.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/31758464419.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/luturifafunus.pdfIn PDF document text
    • http://landia-print.com/pdir/file/77044992562.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/fekimeforuwevupovutejubox.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/mvaq5vc15jnt87o764uh1le8se/segukimofewelapunufovisob.pdfIn PDF document text
    • http://edgecs.net/documents/83775770786.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cc0709fc7---pabazokukikafekijalutaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=excel+filter+data+on+multiple+worksheetsPDF 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_off0000dec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC1 11248 bytes
SHA-256: c5a6326918bc60ed90f3d431b6c96684d338a414acad6349d54cd64235a0b01b
font_01_sfnt_off0000f8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FB 18108 bytes
SHA-256: 6e4788f73d3325f7a20704c0ec5576379e7698f3dcf6e5bb42deb4cfb9371431
font_02_sfnt_off00012767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12767 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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