Malicious PDF — malware analysis report

Static analysis result for SHA-256 408d5ff7508762f5…

MALICIOUS

PDF

70.7 KB Created: 2021-09-19 22:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 659b93967a06919817883d2b3741c786 SHA-1: 65a05960e756dbc9cbe150ed97e24088a262088c SHA-256: 408d5ff7508762f5c90308c5d1b40128189d77255c9b8be6b4a81e68316281f5
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised CMS uploads or hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rhuyscampingcar.fr/images/files/guxumijuzarodarodidun.pdf In PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee241d1718---sumokisasazunum.pdfIn PDF document text
    • https://norservis.cz/files/files/19388489321.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/sogojuleposawaf.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/77377412240.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131cefc69f4e---17635389353.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/70387727584.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/37433660302.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/rubeselulopipex.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/banavamuzusov.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/sepefixofalisegezovudi.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/dewikoxofikidelujajif.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/35387763737.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/pigizupa.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/70948211089.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/rapujumijosumoxe.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/60218171142.pdfIn PDF document text
    • http://castel.lu/userfiles/files/zizizipe.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/45696899217.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/33677407495.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/78014844190.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109012027395685.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/babumerugukix.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16146f471e226a---pijujawumataxaxij.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/13477851154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=sympathetic+division+functionPDF 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_off0000b4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EC 11092 bytes
SHA-256: 88f80c0a601dae0d60caa3a130c40dbd32e13ee2de3c9c206b5ff83ccd65a933
font_01_sfnt_off0000ceaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAF 15232 bytes
SHA-256: bc8a0aa22adcfba77594bbd65881deb279f75e9cf062abb746525ec2a76b58fd
font_02_sfnt_off0000f4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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