Malicious PDF — malware analysis report

Static analysis result for SHA-256 f223b97dbb5a7e06…

MALICIOUS

PDF

84.6 KB Created: 2021-09-08 12:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1bbe7e62dccf791a120723d79727dc3a SHA-1: 0aed240f2d230f80e07b121b3446c6a10a9ef3d2 SHA-256: f223b97dbb5a7e06e11e61c8b63737d82d88297e0c5470eaa0b3026bb0c55e14
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, while numerous, do not appear to be directly executable content but rather pointers to potentially compromised or malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/3b265ed2ce7cb10b270582ed567905c7/ribeponobidi.pdf In PDF document text
    • https://hankilfood.com/upfile/files/gitukefamos.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/84132844100.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/qidm2mrrugi4m5umcnua33005i/48955451434.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f3c9fab8dfb---zubedojinolozexuja.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/ae7f540a3723e9935cede9a98eeab478/17029263890.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/53248716448.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083df75f07f9---44015189849.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/fivalikizef.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ef8532925---50155995306.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/63204939346.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/jaziboneravara.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/84648542406.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/ba6jl5n5c868v8fsrruvq9u9g6/26984499698.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949b8acc4c0---53668412649.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d27e8361bff16fcd9a28ec11bcada901/29572251717.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9028c61a8---78076617159.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85392e474d---dowuzav.pdfIn PDF document text
    • http://araonline.hu/uploads/file/56417482818.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6973fa99770716ac9ff0b02966ce3a8e/57605798068.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd5725f55e---govisunukiluzebo.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/navewexabazixamogagave.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/7ff28375d46ec49e0e9f13f8fb7d30fb/gisoborotabor.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/532684bd9c3844c2b0e74443b23c223d/kitek.pdfIn PDF document text
    • http://10.40.4.17:8080In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=vtu+transportation+engineering+2+question+papers+pdfPDF 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_off0000e1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E1 10964 bytes
SHA-256: c48acbc037d1b6d9cb54ba2c935abf3c808d92c4f9742704cfc6fbd2332262ba
font_01_sfnt_off0000faff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11311 18652 bytes
SHA-256: 61cf15c66af7c943e3f6ae36222244f4b029fd21b7637d3ac000ab5d49345027

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