Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c081ea990cb33e1…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 09:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dc644f41300605783a35808f26895bfb SHA-1: 344fea0a70723adaf1c3d7e99af0579e11478dce SHA-256: 6c081ea990cb33e16590a97d18f18eda5fa03ea38b6eee72fc37d25c5e5653d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various PDF documents hosted on potentially compromised websites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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=definition+of+certificate+of+origin+pdf PDF link annotation
    • http://naturallabs.fr/userfiles/file/vugefe.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/jefevujanivusupo.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/lanijagukisub.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/2jjj5ofb16sn5t83gkcg2uo3h5/6536566974.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/92150865612.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/34601617551.pdfIn PDF document text
    • https://inifd.london/uploads/file/kowopidamegawasixesasaza.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/3752063008.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/xikutoriwo.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/62693380191.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/tawufonifuxa.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/24592482642.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/vupitogosiralazejorijed.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/ad9c2e0ef4f27dd8b277a412b2aa54ea/kefejisajafedegun.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d511c3d4f63d2aef5d7f0d79c1bde0bc/42776505074.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/67307959597.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/h1aslg1ojv4imjkb8f8v6d35t6/95029473721.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/41368361553.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608029cf3d0ec---33866349465.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/43936757950.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/3349d8fd4757ebea5c0f77425517b5ee/sanulipa.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/909a17b55e9224515550a4db03371acc/64815528376.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16129414762d85---dunabukedipenapegajawebe.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/bapadipaweponipefazoga.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/42596884674.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/nopunoko.pdfIn PDF document text
    • https://cubic.is/userfiles/file/41146299399.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_off0000db6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6C 17136 bytes
SHA-256: f37ac81baa888eeb8ffe37a231c77e79ddf9839e7e2d8d6f489eff0fd28a729e
font_01_sfnt_off000107c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C9 10580 bytes
SHA-256: f855ed5228c695de7a5c6b748a94414a0cfbb04f8cb5ff7b596c26bddb6c5f55
font_02_sfnt_off00011fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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