Malicious PDF — malware analysis report

Static analysis result for SHA-256 8688b2c8c01416eb…

MALICIOUS

PDF

69.7 KB Created: 2021-09-10 01:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 16436fb4e5f887cae305f77c989b8db6 SHA-1: 8651be1628330869e8695e9ec68fb431f9d48854 SHA-256: 8688b2c8c01416eb50dfffddacbfa9ef9dd68b67a46d2e32067b97ae85efb811
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were extracted, the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://lltsg.com/uploadfile/file///2021090901480612.pdf In PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/59241945457.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/vejumavidovubifutas.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/94301468029.pdfIn PDF document text
    • http://mestan.by/images/file/30502285279.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/tiwugejubabefimejeguletek.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132937436b05---2605460980.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/tuburovizakoraxapixux.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16130c9dbc6f0d---19224281950.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/36211229918.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/diwemitovogada.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352dcdebd4a---74594780969.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/verelimaruwo.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/gowazaduretipimotixupi.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/73510617460.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/zenewesemen.pdfIn PDF document text
    • http://4yoga.by/pics/files/16412281596.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/lasanapupijepigurotuki.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/14514292857.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/dc6437373d618ae03953d6504c544da8/73428359236.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/tomedumigipokodogarodol.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/22547449810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=download+hentai+games+on+androidPDF link annotation
    • http://irodori.kir.jp/files/file/22416183149.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_off0000b321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB321 10780 bytes
SHA-256: 40eee1c4eca12f17ba3fe15a349cba00a7f065970277cf4307c22407beaca9af
font_01_sfnt_off0000cb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB93 14976 bytes
SHA-256: e668480b527c3a78fe9c156cdd4130bd243d69320fda1229eadcef8af85611b5
font_02_sfnt_off0000f176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF176 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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