Malicious PDF — malware analysis report

Static analysis result for SHA-256 faea0000e87ab71a…

MALICIOUS

PDF

83.6 KB Created: 2021-09-22 09:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3ff4812b5b611eb72ac45ed493490a9c SHA-1: 9b6d939aadbbb965019803baa0ba708e4c9469cc SHA-256: faea0000e87ab71a640bdf19a04c31aa667fc2a00df5c5f6185239cd5d44ea6e
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to various external PDF files hosted on potentially compromised or disposable domains. The presence of these links and the overall structure strongly suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=redmi+note+9+pro+display+settings PDF link annotation
    • http://khaskhaan.mn/uploads/userfiles/files/75823270497.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613446500bd38---52459051330.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/mirodofuxaxoloxub.pdfIn PDF document text
    • https://suncables.co/images/file/jumabifawabilelonoga.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/xapivalufiguluxonipamijim.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/89597484669.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/21898956805.pdfIn PDF document text
    • https://oriolefashion.com/ckfinder/userfiles/files/1321981387.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/23021162601.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/7465da86febbea71ff5126cefa29ba69/sibid.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16145a2eaedfdd---napusedemipopuzizosubuj.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/12336761224.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/17484724146.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/27333233349.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/fanadidijibasedulifiwo.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/mozutuwatafolenujerekajif.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/84409256674.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/sofime.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/69887587142.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/dofujus.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/83179273969.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/21728323600.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/26202568636.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_off0000e1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BD 17464 bytes
SHA-256: 53e5e193a5ae567812a94e10cb0d36fd211f326142650498671be76ea384a4fb
font_01_sfnt_off00010f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001271b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271B 11064 bytes
SHA-256: 77760ed16d2de33df7b2fd0ff30f87bc16915ec98907104ab6a47531c450d981