Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff779973adbf5f5a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 00:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c808792668d049294c13abb2e36ed247 SHA-1: 3e9141cd8bea4667e6b083ba5a8205d5421d38d5 SHA-256: ff779973adbf5f5a11a94091e014930162ef19815d45ead489c5ded1afdab35c
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting it's designed to redirect users to malicious or phishing content. The presence of multiple unknown URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6d5b06f02---45549304529.pdf In PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/9700dacc88df0485c3e0d56265e5996a/benexufonulenulawupivik.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/24830560961.pdfIn PDF document text
    • http://contextuae.com/resimler/files/xemikapuluxizusoga.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/20155023679.pdfIn PDF document text
    • http://wwstationery.com/files/file/xefiranalujopuk.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/sesolafixopajotumu.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/bewijeridenuritexuzu.pdfIn PDF document text
    • http://meta-min.com/files/sasigidog.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/60957251522.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2ee63c5ce---59297169806.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/korobofoxobin.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/5f95494d300d9a4d64e044b0ea291dab/32965259311.pdfIn PDF document text
    • https://interconformity.ro/images/file/19270314923.pdfIn PDF document text
    • https://onlinendttraining.com/files/89750204651.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/perunefujuf.pdfIn PDF document text
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/ninajepojosuguxodetiga.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e33e43dc4b---piguxosudarepodezetuzana.pdfIn PDF document text
    • http://famillespourstarlight.org/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/zaxetesogagejifokorel.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/wapitobapusuvemofine.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612d51f110083---35562289785.pdfIn PDF document text
    • https://ahha.az/userfiles/file/80337728485.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/57995252911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=tanguy+laverdure+pdf+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_off0000d8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EE 18396 bytes
SHA-256: d3c62f796bae4ba807964b1e5f5a731f3e665a94cebac99c740746a7c941e771
font_01_sfnt_off00010860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10860 10644 bytes
SHA-256: 5285de64425fde2c5d2fd2bda8a14eac838515457cfaada0039fa6f649f58677
font_02_sfnt_off000120bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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