Malicious PDF — malware analysis report

Static analysis result for SHA-256 e72ed41d2fecc2f7…

MALICIOUS

PDF

77.5 KB Created: 2021-09-14 18:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 33936f10b69fc88883b448140dbd8dbf SHA-1: 2e02c08a1d37f5a188f87a0be1d19c628e916c6e SHA-256: e72ed41d2fecc2f7d0ce815c88a64bfb51c2d43debc89437c9a679d1de8a10f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous URLs, many with 'upload' or 'userfiles' in their paths, suggests an attempt to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://synerhu.ru/uplcv?utm_term=toonme+apk+download PDF link annotation
    • http://timebymtm.com/upload/files/15398996777.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/nezonuzemez.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/wuvemewotejugo.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/malivejafavedudefusoko.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/25691430106.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/e58d12fb117362d7c1e5faf915befdf0/subulivamegiruno.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/pazopifage.pdfIn PDF document text
    • https://clinicscrm.com/img/files/muzonanovipusuk.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/70145216316.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/85009636453.pdfIn PDF document text
    • https://granitnet.hu/editor_up/kixoxelavos.pdfIn PDF document text
    • http://venkateshservices.com/uploads/tojatanixabu.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/pirjr5ddfvls4l1bojthug2c9f/86931543322.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/91318971463.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/gonafosinufabaxududatud.pdfIn PDF document text
    • http://ukrfirework.com/images/file/48203793056.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/fufujajolitiwiwojekilog.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/kagawefuluvujek.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/eb1048619df38f7e694bad191829c7ec/29996809010.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210912215902.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/9097772230.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/k19msi3kmiqk93q0sgkc549v71/gosegapebuvo.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/gabiwemewibapesagujaxilen.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/43652618811.pdfIn PDF document text
    • http://mariancozma.com/_user/file/dapezonewokozerobozug.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/69932646171.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_off0000cb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4A 10236 bytes
SHA-256: 9a66e3ae0ffbba3b7543ce6623fa8b3aeb981e8d45421696b63d0cc9591da2f8
font_01_sfnt_off0000e244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE244 18276 bytes
SHA-256: a07f4fafd6ee9ea9bb53e507480ea2fa45bf62c130485966a3178ae60cd39ccf
font_02_sfnt_off0001108e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1