Malicious PDF — malware analysis report

Static analysis result for SHA-256 77237d9e27c06437…

MALICIOUS

PDF

94.2 KB Created: 2021-07-21 01:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c9a7c2a36871f181ad7b2f99f8149c86 SHA-1: 5ad1fbe3f30aac67c01c72e3215317eae6711dc5 SHA-256: 77237d9e27c064379e4ccd0500acc06fe7ad8caf6fd96b9d2ec2f331c028577f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://kystop.com/wp-content/plugins/super-forms/uploads/php/files/42d4c9295385d5f15499e6a9bd75d402/46533570365.pdf In PDF document text
    • http://evolutionchonburi.com/userfiles/files/24226639617.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7f40a30ae---bizafenar.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/38558239112.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6d17cf0bb---wipidufodunurewalif.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/487f7caa0371371b04a9d6ba7d4bfabd/41358862656.pdfIn PDF document text
    • http://hotelhoanggiaminhchauquanlan.com/img-kskc/files/64285112405.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609f87248547c---jenobozapoxofoxojefo.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6bab16cd8---9396347679.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/utbcl7et1jtqal6jh0fnamrr43/nuxobuzezo.pdfIn PDF document text
    • http://tipiland.net/upload/file/munejaliza.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/16999586871.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/996ff59353c67cb92bd3be3c78f37afc/10848514445.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/sebemawafelekunepitifu.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/xenotuvejixisowedefopi.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/44607922911.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/18587549375.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/sukijevewor.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/2243eb1d2b0c971ff307c590d71faa15/44656327470.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a114695d47d---99273034313.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/zajolavadazugugife.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fc1fcff2e---84133015594.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcd1d021d1---fatadezuvapatamodolozin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=formula+to+find+frequency+in+statisticsPDF 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_off00010c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7B 10972 bytes
SHA-256: 8098c7023db067634615184562242fd2f4ad6d9a2b84cd7cfcc3f481824471e7
font_01_sfnt_off000125b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B7 17464 bytes
SHA-256: ad37e65fd4278706e87a2ce9fae40541ccae26c0fbfaea37d30508c17dd446d9
font_02_sfnt_off00015366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.