Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde4a5878b3aee93…

MALICIOUS

PDF

71.0 KB Created: 2021-09-30 23:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 37c8cddbc0ba45199fa052c8dc953ceb SHA-1: 52dc5d1228837c29f17420fba16368312d23ef55 SHA-256: dde4a5878b3aee9321e2f494d9670cdfafa1ba804de4f4fffdce53479aab0317
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=truecaller+new+version PDF link annotation
    • https://ubranni.com/uploader/files/tabatukopemisifewu.pdfIn PDF document text
    • http://marketingnews.fr/images/file/7311367829.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/jurevedobiluga.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360ebe4ed85---16440287385.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210909045337.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/sadajibana.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/29307614294.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///waxasexodeponomi.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/47809687746.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/88067748491.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210903_C78B099E11BB96FB.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/votewis.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/58836668951.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/3cut9ph5elmsmkdsg90vhndqcq/94667300865.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469400608bd---68187347603.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea330004d4---dugijikakaxaji.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/garonod.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/645e739f514b809fd944c89dea631f2a/55696631813.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/66656846049.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/71789297020.pdfIn PDF document text
    • https://go2germany.ru/files/file/83597186701.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/selarufazumi.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/lumubexafamijepokomapu.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/85288462971.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_off0000b1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D0 17644 bytes
SHA-256: b39366e6263769c006c34330f0535e7a0da73ba2e94be02bf64931958fa0a10c
font_01_sfnt_off0000df12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF12 10340 bytes
SHA-256: 7ec1d97541696b04efdbd6dc95c99457cc11872e2806167a6f4a30d5b4e96f39
font_02_sfnt_off0000f697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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