Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af21e86fcc8a3b6…

MALICIOUS

PDF

87.7 KB Created: 2021-09-02 01:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 755e228f7ca2996d950a01ec97b45b90 SHA-1: b21980d798f113fa0ef616341a4de22ebf526380 SHA-256: 3af21e86fcc8a3b67316fc0a0662d97520391a5c9431b7f0f5dd1591536a07ab
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to potentially compromised WordPress sites and raw IP addresses, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URI heuristics strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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://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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

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
font_01_sfnt_off00011ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D6 10864 bytes
SHA-256: 8d8722a92714d6a4b33a595cac5815abd2dbc37525c64961c2e04efff9360240

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