Malicious PDF — malware analysis report

Static analysis result for SHA-256 db98378a11477dcc…

MALICIOUS

PDF

86.3 KB Created: 2021-09-19 02:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dd9a54832d7e755bd493b0151a43e0b5 SHA-1: 3226308b11555e7c729d8689c90ddeda45b7ecc5 SHA-256: db98378a11477dcc6640e73451853ffcda9cb1f060ff9cbb1409fa95c87be4b2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics points towards an attack pattern designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://homespakistan.net/magzine/uploadfiles/file/66531446323.pdf In PDF document text
    • https://mosconi.net/userfiles/file/24296363665.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/42153709692.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/jiwipenarasebupitirule.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/27698917388.pdfIn PDF document text
    • http://standardamulet.com/files/files/babutagukolapulopobitawez.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/51581411576.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/pudevojufafef.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/83863021720.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/zasovakolimalefufiwapum.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/vidomuwowofi.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/45645663146.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/5587738581.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/dirudosez.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1c91aab5d---19602885509.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/zotemewerude.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/kodijesetuzizidifefojan.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/e94b95858072b438492b50d16f1488a9/bosebosesiludonexe.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/66931030130.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/87467439786.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/7e8aa6dc6d46db5713c7f11320a49050/finatidize.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/fenolofuvudas.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/ruluwededi.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/5327618592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=transfer+files+between+android+devicesPDF link annotation
    • 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_off0000eb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001034a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034A 18176 bytes
SHA-256: bd32aed2503ec788093ae3b505434ea47b5dfbcb21109f9619c449ea7e16fdb6
font_02_sfnt_off00013287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13287 10724 bytes
SHA-256: caf1960762e8c11b20fa15e917123fa4af822e4da5cbf1996055f2f99a47cfc6

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