Malicious PDF — malware analysis report

Static analysis result for SHA-256 faeec68943a36e13…

MALICIOUS

PDF

80.6 KB Created: 2021-09-23 20:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ab7b5594d77e38ff30adf7a6b4d18ad3 SHA-1: 34e3427c0485ced95fcc0d32aa08e5e12a4d2376 SHA-256: faeec68943a36e1331629917eb1fa4612def297df68c7f88eb308999e1e45e07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings confirm its malicious nature. The embedded URLs suggest the document is used to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://infrive.ru/uplcv?utm_term=amlogic+customization+tool+download PDF link annotation
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/28165f6f1e946ed47931a81400073d26/guwakabibubiretafitoj.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/83012930885.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/gejamewewasuwepasezojikew.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/sopodalu.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/7618500365.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/57876938342.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/bulafuz.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/77977885358.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/7ecee7ac33a1407691f99d870c3eccb2/rimepeva.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/96323220485.pdfIn PDF document text
    • https://yuktogel.com/contents/files/52359870101.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/3977578c4be41b2c3fa886be4472bcc6/16721279916.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/mejuxofoxivokivis.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fe13bc67a---28483733532.pdfIn PDF document text
    • http://msiutilities.biz/documents/kofunejot.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210921163221643750.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/14499176265.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///17502603458.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/63047530612.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/sivabukikagureretu.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/watuvegoteli.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/navatoj.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/kudugubezasudofaranunabu.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/30092964732.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/61450010392.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/49120084975.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_off0000d65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65B 10708 bytes
SHA-256: 3b602d696740ff847c4c2f61e15348485d7eebeeef9c0d9dd8db7c7c12f32981
font_01_sfnt_off0000eedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EF 17640 bytes
SHA-256: 17f08c09fc036fd5d0744c68b0e83ca22d9ebd392e7fae079c95e01698581f4c

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