Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1958c3704e3096…

MALICIOUS

PDF

82.8 KB Created: 2021-09-08 02:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bf3656f077a92c7c6906cd32436aa6bb SHA-1: 2e41ad13b0f4b976dbbee33afca4f350d89baecb SHA-256: 3f1958c3704e3096badfa38604403187e2de36dfb38c23191fa0d650327d3543
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous embedded URLs that point to compromised websites and disposable hosting. These links likely serve as a distribution mechanism for phishing or malware, aligning with the characteristics of a spearphishing attachment attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://picassogift.com/Uploadfiles/files/xologaxorofotozobom.pdf In PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/38306662580.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/48123200119.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/e7b585447f71f11f506ebe4a2f3ac563/98677886640.pdfIn PDF document text
    • https://nilsagame.com/calisma2/files/uploads/jigijaxovewogivuvejuni.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/farurexol.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/tisoxojuguzavujewakarov.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/vapaf.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160992b36f09e0---90731899501.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/dilupirivomasojumukog.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a97ca4678cd---zarupefimes.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16095b1c7579f5---17016216904.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/a0iu9f4msu55amefs9notgp39h/lizanemipadi.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/84468502937.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/22414123634.pdfIn PDF document text
    • https://pasarantogelsatu.com/contents//files/81777270091.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/3286382812.pdfIn PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/tanofijavukadifoxawurizi.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/52c88f0a66a6cdf64ce75823908375ef/vojijirorikaboku.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/5e8ff3829158419db6c2e4ebc5deec1a/biwixuwobo.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/22657359292.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/kuxumupiwi.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/56850041072.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/nabak.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/sedakivulug.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/d50123878bb1c75a54d3fa090152c0d2/pimarozabepabiwukogigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=veterinary+drug+formulary+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_off0000dd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF535 10856 bytes
SHA-256: de7494896f3a6a2feaf4dc17d6479ddc12358c7a5d31959da41037bebb45a61e
font_02_sfnt_off00010e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E09 18140 bytes
SHA-256: 0d15696cb6934e40288015d6c443ffa01b5e5bac1b037d17f3ce686747a94fd0

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