Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc1bd1ec671a6da…

MALICIOUS

PDF

69.3 KB Created: 2021-09-01 05:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 53824a475d47585102d86124eb7f6f34 SHA-1: 11adb63dae9232316f90a5334ce863b56fc07af8 SHA-256: 6bc1bd1ec671a6da0e83d564071136dfddcb05f82b98d6b9889fef43d3eb5f4f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous external URIs and pointing to compromised CMS uploads, suggesting it's used for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the presence of multiple external links and the nature of the heuristics strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://catamma.ru/uplcv?utm_term=pectoral+muscle+anatomy PDF link annotation
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/puzosawamu.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/be553d557d54c3164a8b86a36955e2d1/888660170.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb83666cb7---35051914895.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869faa6b3d4---vagozuve.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b0c36c0dc---45052367951.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/boresasodaxepopuzodep.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/kafasulanotizirude.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/lurikok.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902a21dda38---sudifafufikijuvizipaji.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d3cda3146---65723014841.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/b782d4037f110e9935744653fd5cbcfe/93001772723.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/makuwop.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/norigoregenepusulutotano.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/mizizitovom.pdfIn PDF document text
    • https://harom.ro/files/file/goxinuxafajilupi.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/wewubutukafesi.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/naporabojuwiki.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/8873646024.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/tegutukerof.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/91893454693.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/judikuwuxevexazolira.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/77986026895.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ldfuh0o8p4910td699s1603bn6/pijoletopugofazupaseso.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_off0000b25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA72 10512 bytes
SHA-256: 8cdc1f8373fe48ea1bcc30df0a6e070761a040f84200e3d7b53b0c05470a7226
font_02_sfnt_off0000e275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE275 14824 bytes
SHA-256: 0c7b9d1d64c79e74c9935f2f35e7649699dba0e0e85e7ac9660c4338bc8fd252

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