Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a10a39e2a43602…

MALICIOUS

PDF

68.0 KB Created: 2021-09-29 01:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a85d6c282f428a9de8a132cada77d6b2 SHA-1: f305489c432d4f237645795eaa00448fbd5f7c10 SHA-256: a5a10a39e2a43602e17b1672daaff13b27ca3717bac6005bb7afa703df7388ed
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-only content, typical of a screenshot that hides a clickable action. Multiple heuristics indicate it functions as a link farm, pointing to various domains, some of which are hosted on compromised CMS uploads. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to a malicious site for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 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 http://timandlor.com/userfiles/file/21594249284.pdf In PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/43985760102.pdfIn PDF document text
    • https://novitas.ro/files/gutibuzidelarobamemiga.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/jojogesuweb.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/gakegali.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/57724459521.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/jibavilarafogu.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/zelitabipasapemiwum.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/gifivonusorevisino.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615034281557c---wizumegetazariziravomaz.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/9bf58ef64d1d9d6adeba7e5b21b234db/fexexikafi.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109141020299970.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/40055801124.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/50857003037.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/fuvobezosunid.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/fikemuxebowixalutivaxi.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16149d1b1616ba---99924987369.pdfIn PDF document text
    • https://alertsecurity.in/ckfinder/userfiles/files/jigumigimuwefaso.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/50249561787.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/tafijeripomi.pdfIn PDF document text
    • http://keyday.ru/files/files/82101178291.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/zinigobavuxotemusadepolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=atlas+of+world+geography+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_off0000ad77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD77 14348 bytes
SHA-256: 9b3e5c3d651a22c90c5bf3e83e61e0096f0711e4568b2987c0947362b81ac1b5
font_01_sfnt_off0000d1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BD 10760 bytes
SHA-256: 108b7a30f440e5056556a39abfc1e688c4a8b5bf8beff0e026c39f21084ef41a
font_02_sfnt_off0000ea8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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