Malicious PDF — malware analysis report

Static analysis result for SHA-256 670346b3c984b7c3…

MALICIOUS

PDF

87.6 KB Created: 2021-09-01 14:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 25f07c825e58e023944a1d289043248b SHA-1: cd78b682b9fc49b4f7047da56c422247ec2fc956 SHA-256: 670346b3c984b7c38a9c2a6bbdf9be180935e20f97864531918568920d4f4dcd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e5578e52c4e---salipirireriru.pdf In PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/pozebirofi.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/7e3c94d4c544580c61f047c0f5373be8/65251813955.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec81724a11---83853160072.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/33760239390.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/51301244968.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/27447998124.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/rogeferewopetaxufa.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/gozonibilikudu.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/f1519d3a388a98e89782bdc297e6796f/82290981184.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e02635ef529---wepasot.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b0034a053---58794330546.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/a0d2o1rhk87fe0uqvd1jggj6ft/50317746464.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/fobogalijewanalin.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/pojaxijesaxawuvikomija.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/kuxab.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/10360357295.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/88719540806.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/1ea63aaa346f2ec405baf8ae098118d0/60970628867.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/26687105250.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4ee39474c---49471670591.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/77e0b1dcb8b5f893aa2d7e54f797e703/8607958446.pdfIn PDF document text
    • http://laduses.nl/image/file/12040386769.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/5i2jn6bl756bl8g42krj293437/45187406113.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/2021730194576072.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078be9d54def---79070019022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=drawing+from+the+right+side+of+the+brain+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_off0000ecad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BF 18628 bytes
SHA-256: aafa6dea3f427f414241e571a191b9f7e944a536c871214f1727915f963b2956
font_02_sfnt_off00013505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13505 11124 bytes
SHA-256: 81ec083d602f086b8b859a4ab96ec94ececc2c6e0b4ee4e55dfd31761feeca11