Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd74e8563ce578c2…

MALICIOUS

PDF

95.0 KB Created: 2021-06-29 02:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 10b624ca546abe692750a28be82b08e4 SHA-1: 4f6b612f6d8c4df97a648475ca53fd8bdc060453 SHA-256: dd74e8563ce578c28028a82a867d3cfb03e0f3e1a75b234d08b782def6b5a30f
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or redirection scheme. The document body is unreadable, but the presence of external URIs and link farms strongly suggests the file's purpose is to lead users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d99bd01e1f1---101311491.pdf In PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/51752225918.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/75022087538.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/pusisedamedobuw.pdfIn PDF document text
    • http://boxethai38.comupload/file/bagusosimanemugo.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/67727060847.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078925f39e90---75440789144.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb8bff2318---ginokidisipa.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/2c4af78eb97e68d48be10e98e2f35a36/57361536151.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c820314e565538af4131c7586fb42260/38632546632.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/ravujomu.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609943aec5120---bafemuv.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd27f73c4e---82695931725.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/nitobirusixutipo.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/963a9d75042715dfc6e4196509f6ac34/23636892336.pdfIn PDF document text
    • https://luminex.pl/upload/file/5641555154.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3eb456d34---puponivelumu.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/7856b9c6aa45a744b13aba85ab29dc51/giwiritebafetiwakemube.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/iuo9455kgfdnjv7v91spted84s/komakituzaw.pdfIn PDF document text
    • https://topplene.com/upload/ckfinder_temp/files/20210610110428.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160afdb55122e1---regixakukomugalupa.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/5926895294.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/zafekewov.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/48259663637.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160b883f92a136---mupujemiwuzulijemifele.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/19747338207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=mixed+berry+tortePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11135 10112 bytes
SHA-256: 61a50d6659e4f61154fd0630a5a9fba2e84a1d7cf7d7f6187c9df3a852449fc8
font_02_sfnt_off000127dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DD 16752 bytes
SHA-256: 7c1a8eb0b9c23cf203c969b5d5d5631f8eb4ae760335902abb309347e0b2a7e8
font_03_sfnt_off00013f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F6D 17848 bytes
SHA-256: 5b6592743ffb15b178bdcc377f60176f238605d66f53b3fdca130de9ce9c36df

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