Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35e38331780684a…

MALICIOUS

PDF

70.3 KB Created: 2021-09-02 01:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c903a98955c7fb5645cf02fe86cb6988 SHA-1: 5f8de2977fc231825bc9467e4f88cc25b8fb6a99 SHA-256: d35e38331780684aa50687157937b7194fe32bf1f7ca7b2a3044ace8913224fc
174 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URIs that point to compromised CMS upload directories, suggesting it's used to redirect users to malicious sites. The presence of IP address literals in URIs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9401

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
  • 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
  • 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://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/6662d59a03a64abda5ba9ca06cd71873/38152592978.pdf In PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/7e4b59f032b76b9b21e125b36607ce34/81938461453.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/fubamoxokatunuw.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/besisepurojagupuzalisafi.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/c95fa2f2e273a697989098804b01f1b8/fajinoxopexodofutok.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160723f6ef2636---xereterovubimif.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/xawesomarizezup.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160af939b1f202---55795771562.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083dc5e1ce80---56454513560.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/bobuvoxabo.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/36459751873.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/65673380843.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/89432579345.pdfIn PDF document text
    • https://qqhanoman.com/contents/files/21202183090.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/6897402952.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/3042850024.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f99c06946a---15162450719.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/d5a48ddefbc5afd09f77c2ffb2300d4c/43813996084.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/8fa03e6f98a11c13f6d2e3fd042d5b46/nuvakivulepigegapije.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fba5a85667e---wigarevebobazinazikigewiz.pdfPDF link annotation
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/nubigumozabapoto.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/d93f436c6d1cca389d9f79cb0142f5f6/rugopewifojanipug.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160781e2045f24---nawolivotewewobemixuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=climate+change+essay+topicsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 17952 bytes
SHA-256: e64c1be88cd53b98b50c5c082ac98164436999f6f451a4054fb556b2cd45061c