Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae76202b882a90e…

MALICIOUS

PDF

79.7 KB Created: 2021-09-07 17:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e0dd71942749f9dbd23a986015e42faa SHA-1: 92de32e40bef0a7362f784a4939904bc0f2ecc6c SHA-256: cae76202b882a90e9799d8b72850026a1f531b90aaaff59c18b79e33f6e57896
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 CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=wandering+through+vietnamese+culture+pdf PDF link annotation
    • https://aterhesseg.com/up_image/file/benapikifasezo.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9195e37c6---32288766517.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/49192000009.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/39783172875.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/refuvoletiz.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ce90015ec65---67505756977.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/98294602849.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/327ad5a599fb15de793deac338368aa0/dodizidude.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a65f36474dc---49073532979.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608719dd24644---vumasenabezutewof.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c922b04d529---nobojelo.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/9612a812d2c2a36fce7b84574332edb5/70420527262.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108b6aa33707---42111885507.pdfIn PDF document text
    • http://deauville.ru/files/file/golafavuvuburan.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ec916c10d---liduwikanesala.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/29152062839.pdfIn PDF document text
    • https://faceless.me/userfiles/files/5888486909.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c563ba00776---18632963667.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/zokiru.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/xuliliridex.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/91901629411.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/nelidedid.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_off0000cc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE497 11224 bytes
SHA-256: ad5b2541200850a2d0ebecbbb18d2034bf5c7f329e2e20cbde977311fcb93ff7
font_02_sfnt_off0000fe78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE78 19100 bytes
SHA-256: 5e6730a259a8afee5846c31a6367825d725b5c63c0c78abe293f994fa886a19a

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