Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f0f253dbd27035…

MALICIOUS

PDF

84.7 KB Created: 2021-09-20 00:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 479635a55989ed4e62dcfc16123752b1 SHA-1: 4164c501b8364a2532bcbcd28e3c76c2162fbbc7 SHA-256: a7f0f253dbd2703561a42de8d0850b360b115b806e215a89684daebecbf7b6eb
164 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports this, indicating a lure to trick users into downloading the file. ClamAV detection and ML classification confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catwalkdogcome.com/editor_upload_image/file/91371160210.pdf In PDF document text
    • http://henskeschildersbedrijf.nl/upload/2450980592.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/75798571122.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/33617538276.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/502affb086fc6a660d68fbcd9df62c26/84372189116.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/febuzajegaviw.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/71784011061.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/58630833673.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/luvusurudedelexamil.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351683d48ce---sidomorubiku.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161371e850a16a---6703299076.pdfIn PDF document text
    • https://pmms-online.com/assets/file/95791864971.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/gujolagujes.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/21016219861.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/72557063926.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/gigorujimuboweder.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/mudipefokapabofumamumew.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/mubepede.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a819ac99d---34343201397.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/xemaban.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/30350279269.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/63630885828.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/625699110.pdfIn PDF document text
    • http://hocomesun.com/upload/kufukulimonibepogaful.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/lenoxasimiwopunagaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=advanced+grammar+in+use+5th+edition+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_off0000e00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00D 11300 bytes
SHA-256: 712f60071522a12eb8701bb45cf74ab961bbb3a52a5ae6000cd8e98ea0728fd3
font_01_sfnt_off0000fa51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11263 19228 bytes
SHA-256: b30c303ba7c0fa8bb2f06653e33164f31efea33b2538f8cdc2a9371cefc9d392