Malicious PDF — malware analysis report

Static analysis result for SHA-256 e495ffe02d5f0cbc…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 08:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d2bbfa318174937c8e6e2072dae59025 SHA-1: a7648265c7dd5a98237676f838d419882e13322a SHA-256: e495ffe02d5f0cbcd82aead4e83b879a647546153d6ce204b5497011eece9f57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to leverage search engine optimization and compromised web infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://philabc.ru/uplcv?utm_term=classificacao+dos+lip%C3%ADdios+pdf PDF link annotation
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/9bcec3989f13b3ab7392a7ef83c099c3/vubobagidatipivudul.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/veludiduge.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/94291269388.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/75490632117.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983baeed1c1---29031264810.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/60209297274.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/dufaj.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/59537873622.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/09c1e5c7e23ccef3586fc7702af5cf7a/24841570665.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/rmetp80rkkg041f7nf64i2bl68/vudiwuguwuxek.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/59588649601.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/8e0a22a5bda7d8bc474bb86fd9584455/valedofiputinunedaz.pdfIn PDF document text
    • http://jaika.in/images/documents/files/788878305.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/4557483720.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/jijozojupovudepuvuxuga.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/lonizaneralivezufeniduwev.pdfIn PDF document text
    • https://avenue102.com/uploads/file/porezeperiwufeto.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/36505071853.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/79268290790.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090369c4ef63---mufofudomifabexekux.pdfIn PDF document text
    • https://kueapem.com/contents//files/51325627446.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161007dd1022a3---povozatitelajikoguvu.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608380fcb3ed9---jutilixapebup.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85318188114.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160adaf6140d2d---21145180432.pdfIn PDF document text
    • 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_off0000dd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6E 19836 bytes
SHA-256: 771be2dd29c2e4e1b5e735280f0d64e13c2c4fc372452a292d5d967a76a9fe6e
font_01_sfnt_off00010ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12709 10272 bytes
SHA-256: 99e9453dcda3bcf4db9f7a082a362ab3a5514ee79101bb20f96780d2521bc8b3

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