Malicious PDF — malware analysis report

Static analysis result for SHA-256 8717ba601930692b…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 04:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 819e11baef014410a11569bed8a592d2 SHA-1: f8c0096947131d0b2eec5f748d425b3ded2106c0 SHA-256: 8717ba601930692b5ec3d30bb4f269afe528f8271ecea294cddabcf4513477e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple unknown URLs, with several heuristics indicating a compromised CMS upload or disposable hosting. The presence of embedded JavaScript and a high ML classifier score suggest malicious intent, likely to redirect users to phishing sites or download further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://amadesafar.ir/basefile/amadesafarir/files/nusumopadamasixunife.pdf In PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/53852399008.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/dufiwaxozakit.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/bodijekoza.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/vopamumomavejo.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614689ca813bd---92014098506.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1612f57478938b---60853169496.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/67446095093.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/fepilapilekafar.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/pajepixam.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/40356579528.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/gafiluduxuwutola.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/40469653670.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/vubojelusub.pdfIn PDF document text
    • https://digicpictures.com/downloads/bonidoxu.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/c359c7b07448a5a20086cfaa8e06be78/malemuwosananumudo.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/dezuxuzerirevisukisuri.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210906165247.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/telewaven.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133e04ebc30f---xeketipelabidurew.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/66309382145.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/leziniziriv.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/19899900329.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/busixeregakapezinawixele.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/3044673199.pdfIn PDF document text
    • https://bloc-immo.com/images/29801910054.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=compass+for+android+apkPDF 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_off0000cdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C6 10508 bytes
SHA-256: ac438224680f0bfc08d466f5e96c05f56066248c079794778d9c29df948a3375
font_02_sfnt_off0000fd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD99 21936 bytes
SHA-256: 185aed616d468fedc89fe76c9315c7223d4aa1393c4e7e35ba6488c9fb2a2c21

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