Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b04648a1ff6d9b…

MALICIOUS

PDF

87.6 KB Created: 2021-08-24 15:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8094c15860002040144146e948f49a8e SHA-1: 461dbf5500574578b6c3327ce399165a9dd09f77 SHA-256: b8b04648a1ff6d9b1a382664bfb8a1bb89d64eda54e8a3fba9d12190cc5a140d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external resources, some of which are hosted on compromised or disposable domains. The primary purpose appears to be directing users to potentially harmful content, such as phishing sites or malware downloads, leveraging a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://evermoral.hk/upload/file/1624354701.pdf In PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/kifolevep.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/lavopigipen.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096435f23b31---87398460542.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/77357674820.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a49d7dc5bc---90346354037.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/nukutopolax.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/rovikiwuvodepurulolopiw.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/83513385528.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/rerutof.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/064ca505e714cf7c2a8750ecf69ccd31/80448575825.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/21981377498.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/98bd08af1f89ced46d3c82da886e5782/20806028540.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/vusimawodax.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/jevanilafanedisozuzerebud.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/fogati.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/88774651874.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/333afadd5eb55c96f156c1ef250919be/5071253068.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4eb972d35---83848303136.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608760aa7ba22---47665562573.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607886746c4bd---28689084361.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/97732608539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=sequence+game+rules+jacksPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/eef69fcd4c4dca182d3e1ef664d05d62/wajikitazig.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_off0000f4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C2 16752 bytes
SHA-256: 1d6cfcc1324a4ec68b32eae71ad98dfcb63850dcac302e8b66370e594d907630
font_01_sfnt_off00012049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13860 10808 bytes
SHA-256: f7d4905bfb61782e7e61c7551bac6febbe2442f77478390511993ca47b006809

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