Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbfa942b92021d95…

MALICIOUS

PDF

86.8 KB Created: 2021-08-06 23:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: a66cfea907964b6401537716ac2c29a3 SHA-1: 2afb2929d1473242a1cd250c2e079945987bd074 SHA-256: fbfa942b92021d9515176e7531564c060ab697ddd934417f57334af7357fad6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • 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://primethailand.com/ckfinder/userfiles/files/zadifupajezoxon.pdf In PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac380da34c7---lekoxexatetexopukenawukev.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0ada080222---girixobi.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0c857d276---zozujagofumakejituz.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ccd88ea3cfe4da248d30e8cad97e9804/38566003316.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/notazorumorumavitufuful.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/63019208639.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/35146110337.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/memalemotamawe.pdfIn PDF document text
    • http://szpk.hu/_user/file/71346891155.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/01ed1886dfb3d4591b858782f42e44d9/lanogonuk.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/e309fb4d26a448c429299d3807106802/suvisowunigoz.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/76459344572.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/gevazamabikojowazokowiv.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/mumatenem.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/bunabotarulumeruxovag.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7766a6e636---97148850948.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/e4894h84i1k8qkgfhkpe2dm2nm/81623604251.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/nediworuvuditeduniso.pdfIn PDF document text
    • http://immopolignano.lu/images/vozogemafunexijo.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c28841d1b50---60246197021.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/91257971464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=letter+of+sea+protest+examplePDF 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_off0000f132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF132 17372 bytes
SHA-256: 6be66574bb07501e8feb6b6911c6db2b696f39b90e30a370a57836585dc22368
font_01_sfnt_off00011e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9B 10384 bytes
SHA-256: e618496b2638813b379f039d93d2d5051a734e0b0d87bc5c4485824af7ca08c3
font_02_sfnt_off00013634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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