Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57856109aa7ad2a…

MALICIOUS

PDF

68.2 KB Created: 2021-09-19 17:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: de49ff39d2ef857ecdf6f99e9ba89a9b SHA-1: 3c4b3accf5f70cdddf77e3979f2d0a997e2da616 SHA-256: c57856109aa7ad2a5c07fd61e23cdf19db17ad8ae590de6bcd90faab7d6d400f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing lure, including an image-only design and embedded links to external websites. Heuristics indicate it functions as a link farm, potentially directing users to malicious content or further phishing attempts. The presence of multiple URLs hosted on compromised CMS uploads and disposable domains reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://coretry.ru/uplcv?utm_term=best+android+downloader+for+youtube PDF link annotation
    • http://dalnoboy.net/data/filestorage/upload/files/38036055792.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd3ab78819---riwebafifuw.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/saguwapavotabivak.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16140027060112---96661221150.pdfIn PDF document text
    • http://www.og2c.com/images/file/domixevutidevom.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/20864587162.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/73627247646.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/gewasokukagef.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/ponemopejepafipobopu.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/57192536552.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/laxuguma.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/46783928001.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/9969734924.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fc6f589f6---14499532891.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/92195657183.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/vusuki.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/gapefebasumeselifo.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/32554131528.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091808000971.pdfIn PDF document text
    • https://nppgursaraijhansi.in/ckfinder/userfiles/files/6508070196.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161428ce41ea9f---zofifefewanato.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/2885024738.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_off0000ae3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE3C 10840 bytes
SHA-256: f6ad5a70d439abbaf6d19b621acba953d04cdb4a813a405a0d3be0e531816a1d
font_01_sfnt_off0000c77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF90 14508 bytes
SHA-256: 74faee6e55fd3ae806a09bce09ae1dfd07bef306d22775ae7145173dd1b66471

Open this report in the interactive analyzer, or submit your own file for analysis.