Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ad41dc1108d2fd…

MALICIOUS

PDF

89.2 KB Created: 2021-08-12 11:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 783217a8fdbedb51c3747c026a5cb80f SHA-1: 7bbf9b7738f8aeb77b5732b553600700bf4434aa SHA-256: b9ad41dc1108d2fd62ecdcbf54d7f535bd83abfc442e3e14cb9c8bb78445f247
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress uploads or disposable domains, indicating a likely phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the extensive use of external links points towards a social engineering attack to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://bitite.lv/media/txt/122/file/90568841132.pdf In PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/e5792b5110300d41b31bc44e5dd18173/41434183286.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/23784512338.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/vidusenubix.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/14873369932.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/29b0790c4e43178cb8f76c8553801c53/73251281194.pdfIn PDF document text
    • https://laps.pl/userfiles/file/50215735208.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f223626a91d---19539756998.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210804075237.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210618214735.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/84868932445.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/um3b1ovku69ebcdbot61q0hito/feduxenolino.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d7a7b09ba---69358443550.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/71800433527.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a3380f61f21---zipufozafadasabon.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a69ba8fb86910f51f590f2da198383b7/sesigijirisuvevo.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842d0b98734---81044475291.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160749a5625d19---wisepogas.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/vepumuz.pdfIn PDF document text
    • http://tianfonmm.com/d/files/42716885463.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/203df32c66fe04b93b5df68f7e0c898b/pobatodisike.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927c101aae0---domesasili.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08c3df22d8---sumogizebidavorixas.pdfIn PDF document text
    • http://didula.com/img/file/60226080786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=streams+in+the+desert+devotional+appPDF 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_off0000fa14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA14 10796 bytes
SHA-256: 0ff89006cc6bcca633e6446f0051e29b873648b757c796f0258576a24a9d6f7f
font_01_sfnt_off000112bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD1 16784 bytes
SHA-256: 1574d0a9cc3b0de8e96497775b23a0105d0d4bce54b2d2203fe32f232bdd2ff4

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