Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3b8855f103e5bf…

MALICIOUS

PDF

98.7 KB Created: 2021-08-03 03:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7bced940b8828de0bc12ae9da89c4750 SHA-1: 4179a28dffc7fe871cdb97dc25fc4fc0b55b48ce SHA-256: 1a3b8855f103e5bf2fac5a2beaf3cb346adf48a26c077a48e2056f93240ebb8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic findings point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://eakqshop.com/ckfinder/images_store/files/daponiwotizunusesow.pdf In PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/nerevoguletijugolivopu.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778b0cae453---gunufutefipibibumuxakipa.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/49722288877.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/50743650408.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/bejefi.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b08f1ed8f---40428321065.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/36d7661b5cb3beb7bc8814b7a90a461c/rufiwixateputugamew.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2834ae4d8b---venuvedifevavugiganarumor.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/59693046603.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/nilazevi.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/givedatirosigitenozizuv.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/8497752308.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/9d11d477f9cad19d5207cee1a385c03f/sobuvidipinuvonetire.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad59dd3c70e---rixejudevolipotek.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/86894920327.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/suncbkucrm181vpduf96rjrdh6/54131493301.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/47053575123.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/16284062285.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/08231ddae3b2f1423baa53810a660d09/87495135735.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/14947029994.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/6988757449.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/86037045050.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/20a49f0a9697e0c3bee5763b36bc0928/wivojevivugipawanunipedo.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c78c0dbf5---34166528700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=batman+begins+mp4+downloadPDF 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_off00011cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF4 10992 bytes
SHA-256: b45c8c3857904805bbcabde873a7329a5d5484dad2e5cbe4481c9a650bcb7eb2
font_01_sfnt_off00013629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13629 17280 bytes
SHA-256: ed3b4d8b43bc960ae40a224f799445e525ed206b2f6f4b2323e251dd4fb6334c
font_02_sfnt_off00016320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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