Malicious PDF — malware analysis report

Static analysis result for SHA-256 9566262ee57fe4b2…

MALICIOUS

PDF

73.3 KB Created: 2021-09-12 12:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e35c393486d2ad70f6b5591970d523a5 SHA-1: d798fb5f222e108f17cacf7a45c38c27dae193be SHA-256: 9566262ee57fe4b2ab5ef3363a23302c9c26d2ae6a4fcb4d860feb2ec9f6f140
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of 'robux generator no survey' in one URL suggests a lure for potentially younger users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://2ruoteexpo.it/ckfinder/userfiles/files/poxifijakevuv.pdf In PDF document text
    • http://studioaba.net/userfiles/files/xidunimadunukozalubu.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ab418e0d8---34201799900.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/54232049569.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/94838645623.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/ganutekis.pdfIn PDF document text
    • https://abss.pt/userfiles/file/48867424129.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/rujevuwil.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/jezamuji.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/fomolina.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161320b132efd6---20106228773.pdfIn PDF document text
    • http://sartor.ru/upload/files/tomazidoboxaxe.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-5/20210905065031518231.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/boxodobobufe.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/kileguzonodovuxixovij.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/11515931438.pdfIn PDF document text
    • https://bursac.net/userfiles/file/43148252470.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/88147105431.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/3a957c3d4c8be934b321c078ac0653ac/kujitivazuferodi.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/55920526231.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/jobixuvesawuresufiginit.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/julawebexowanewew.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/jatalolis.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/xifomesages.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/xokiraritudalinij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=robux+generator+no+surveyPDF 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_off0000be20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE20 15912 bytes
SHA-256: ac029d2c7f475c2337116fd76ec3c1f654d71801ac09cba90e5ab8a8380ba52a
font_01_sfnt_off0000e69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB3 10712 bytes
SHA-256: 9a748fb545e08b44f2014afbb567ae6479dacb6063b9dd19b7acab882d575c14

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