Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cdb7ceeabd8fa4f…

MALICIOUS

PDF

79.0 KB Created: 2021-09-17 01:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 721a2fbb4e095c6af2a74a91aabf2ae4 SHA-1: 565afb964e1bbcacb141d5821646ad73215a4650 SHA-256: 3cdb7ceeabd8fa4f2e4d4ddbfd8f6d5223a14a86f0b296d9675b7b04227873fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or appear to be part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://irlanc.ru/uplcv?utm_term=watch+cricket+free+stream PDF link annotation
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bfdc5aa3b---xifajoxikalegutobigevu.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/redinoz.pdfIn PDF document text
    • https://kultmotor.hu/images/files/lifik.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/kapuvoresawoweruwerabum.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tukegubamufe.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/83030048646.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/27527980621.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/bofipizarinunojijap.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16143ab1d66375---kajugabutibo.pdfIn PDF document text
    • http://c-six.it/userfiles/files/xemazebulogijajerewog.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/97584315100.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/26772376747.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/gifanedozenoju.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/26751587043.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/zutobulawovogopigus.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133a5970eca7---sojurixekuzixuzawaz.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/14184664172.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/xekigebajevup.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16139a54b21269---dodaki.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/kimarilaragarukafiteguw.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/4264255926.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/74751368504.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b54a66391---37083247722.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/1sbgdo8l21cqq5h0m978457ga3/37430132503.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_off0000d095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD095 17520 bytes
SHA-256: 0dd4b4ea7c7a02c34d34619454fbd659d061b630e298dc05603bd59ea751fd56
font_01_sfnt_off0000fe6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6E 10416 bytes
SHA-256: 0fe0c7c0353f1f5bb56eb5542236e3bcd35b09ad2950be287ea596f3cb36c36c
font_02_sfnt_off00011616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11616 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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