Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a4a73aaa8150cf…

MALICIOUS

PDF

85.2 KB Created: 2021-09-18 11:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 605cd9f8f41f9f3687e66051f0c24b25 SHA-1: 12d34665fba1ad15de4b8f75c55556d1826ee37e SHA-256: e5a4a73aaa8150cf0dd5622952224111f66e6767e6a0669c686b3f1f1932b96b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. Heuristics indicate a phishing and link farm pattern, with ClamAV flagging it as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=modded+hungry+shark+world PDF link annotation
    • http://ms-beauty.com/ckfinder/userfiles/files/62403249689.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/12243875222.pdfIn PDF document text
    • http://turatabor.hu/media/45357185093.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/bukedodevizavuzodup.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/balelije.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/kobara.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613258cdc9d54---kikutopinuberarute.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210908002624.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/46322964126.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/25470301560.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/fivevipejajijizoregide.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/abb2d6dec5e20f0aa31fd44ecfa9910e/mofifarapewaxevamidetegis.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/55936524256.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/39450908539.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210913080408_5c6n5r.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/gebefa.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161399b2d2289a---64897807230.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/ridivokijexexazedogulav.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/nabivagupujipovofuda.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/pikagalen.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/30557307545.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/zolow.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe1ce3d9b0---90528013031.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/pivotutarevix.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/varipavagagamu.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_off0000e5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CE 10720 bytes
SHA-256: 109a2b76f8fbe6cc7989e26ae980caf60b7beb088b65fe443e0c5e3426c88a71
font_01_sfnt_off0000fe39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001164b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164B 18496 bytes
SHA-256: e0b0bdd902cf793573e04b08e9265f8dfe6870e8aeafe92689da733efd1bd076

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