Malicious PDF — malware analysis report

Static analysis result for SHA-256 14908ae6e8903777…

MALICIOUS

PDF

84.6 KB Created: 2021-09-03 23:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 17cd809ad5d2b985bb39441c191443f7 SHA-1: c0d4621386a715b99421915a52e62717613ae3f7 SHA-256: 14908ae6e89037778b4b60e1dae49ac67a8fcf7e401f75c6c7c0ef2e5f3da050
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure itself does not contain readable content, but the embedded links and heuristic firings strongly indicate a malicious intent to exploit users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sangjeom.com/userfiles/file///70794611018.pdf In PDF document text
    • http://gps-tw.com/CKEdit/upload/files/nukiwimape.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16078d72ee1fd5---buvokoje.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/67970651292.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071fb1b10ea2---zimuzumakuwikejopi.pdfIn PDF document text
    • http://domuran.pl/files/file/16821368766.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/gawavojogemovu.pdfIn PDF document text
    • http://usmleworkout.com/files/file/11219590366.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/90182253965.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/90731520476.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/53134818081.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30b8431454---kojad.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607041f468368---kebutilonigomodona.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/junidugirex.pdfIn PDF document text
    • http://bociany.sk/media/file/25752576426.pdfIn PDF document text
    • https://airbays.com/userfiles/file/86788722254.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc0b02812d---lasoraxemasopojufogog.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd32ae4330---nipulisowizonirikilokawu.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/d5d3266880bb70ad208d4d214c955eb4/1652939301.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/39125802877.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/kavizamigafida.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/63855046185.pdfIn PDF document text
    • http://dnepropress.net/files/file/24968039347.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/214ba48e3e3142f37e0ddf2b1e4e8470/mufulovukipodus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=human+anatomy+atlas+2020+pdfPDF 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_off0000e7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF8 10780 bytes
SHA-256: c632e99edca89caefe693523fcd3562f72451fc29577bd2d22d60b04a25db0b8
font_02_sfnt_off000118d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D9 16916 bytes
SHA-256: f355c9221ad18d50b03f23ff33be923cfecbd7f1c8c2ffc53431264840234649

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