Malicious PDF — malware analysis report

Static analysis result for SHA-256 977b33bcaebe5c5a…

MALICIOUS

PDF

80.7 KB Created: 2021-09-22 17:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 880a129cb6e32be5588ea4b3a52d193d SHA-1: d5c63fd583716da0533c24cb665cda9e9cbab797 SHA-256: 977b33bcaebe5c5ab440aea0216ba923f727b24c7d6b4d9f6924bc01fa53090d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating phishing and trojan activity. The document contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to redirect users to potentially harmful content. The presence of 'utm_term' in one of the URLs suggests an attempt at tracking or campaign-specific lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://wastran.ru/uplcv?utm_term=top+gun+2+online+free PDF link annotation
    • http://onnetsolution.in/userfiles/file/rojepopujagesuta.pdfIn PDF document text
    • https://tranthachcaodanang.thicongmaiche.com/uploads/image/files/gavikidusujud.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/61946500506.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147075f82066---1242911059.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/sajevivijonorivoke.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/97dbc9a9ef37d2c853aa7ff5aea3fb99/vixopaxulede.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/22949342366.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/5976653199.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/sovizerorogozeko.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/1395492270.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/37927957757.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/kivabedip.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/26264674200.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/50255956748.pdfIn PDF document text
    • https://avenue102.com/uploads/file/91343584334.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/90711733907.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/paweruloxume.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16142b35b79219---kamozisarer.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/nevafepuli.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/14416669169.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210912204651.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/dazabemavekajetorimik.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/banemugutexotepaw.pdfIn PDF document text
    • https://palet-school.com/files/files/mitulazuriwetapari.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/85737598613.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/95345046646.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_off0000d7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FB 17700 bytes
SHA-256: 9e34d2139c3cfc22ffc6e5b2c8f2a4318ab92baa4260ddcedbc7cc29ecb660b6
font_01_sfnt_off0001064e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E65 10288 bytes
SHA-256: c91ac7915640462dea26e75e5025b943093bfc6fef840089b836ccef7ba083be