Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f64ab4a80da32e…

MALICIOUS

PDF

77.1 KB Created: 2021-08-28 17:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 119601990c09d38a0a92f287643a5749 SHA-1: 54c10dcca9f34bc1f4efbbc871d7f63153358cd3 SHA-256: 99f64ab4a80da32ee75bc75464c40411cb39b9e1ab063ab15499f3cba274806a
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, including one hosted on a raw IP address. These links are likely intended to lead victims to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://eslms.com/userfiles/file/jidutitopanilexovadovif.pdf In PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/jucrmnp19fagshoa6ra3t9cjj7/19800617448.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9ed90b90f---jufepinukaninima.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/531598050972f29253f16f40dd58672a/3690701918.pdfIn PDF document text
    • https://zold-kommando.hu/files/29888739477.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fc45f0297---91891017112.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/tuwofazofobi.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/72435067164.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/rulugojilimesezatibami.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/8345977237.pdfIn PDF document text
    • http://poorclarescork.ie/images/30758560023.pdfIn PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/56580564419.pdfIn PDF document text
    • http://millecolori.it/images/file/sinanufonukodowifi.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/81004757173.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/tizonivojapozoduwute.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608285fb21c06---wisesexejeporuten.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/nawumumopatepepit.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/28449357307.pdfIn PDF document text
    • http://sun-tes.ru/files/file/pesem.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/bazoxurudox.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16096364c3c4e1---buzujopido.pdfPDF link annotation
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/45295ac2e54abde1e9aefb0edd1f3e57/68696045287.pdfIn PDF document text
    • https://purefeeling8.com/data/file/jibogileta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+draw+sea+turtle+step+by+stepPDF 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_off0000cd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD35 10620 bytes
SHA-256: eb58286d51320d0c9c0a930f78baf83d606be5cd6c739370ee0c7ad95371c126
font_01_sfnt_off0000e572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE572 16136 bytes
SHA-256: 790e49640b6c851d44b993b4b32f00fef4deffdc135d24cdcd3ddbe120959a3e
font_02_sfnt_off00010ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1