Malicious PDF — malware analysis report

Static analysis result for SHA-256 654fcbbb726c9d9b…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 17:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0c1fa598bbd7ad92ca383ab04c8322cf SHA-1: cf110e671b8c8c04d7efb610679efedbdb2a645d SHA-256: 654fcbbb726c9d9b98c79ba4806c3eea3b6b09a111e8c9c5a4e0d2359436dc10
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, hosting download links on compromised WordPress sites, likely to trick users into downloading malware. The presence of a 'download button' heuristic further supports this phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141756d436c0---23611284494.pdf In PDF document text
    • http://duda-tech.pl/dudatech/upload/file/ketivorodupuv.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/29951185452.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/menupuxekutufureme.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e841497141---68089141279.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/fefidabiz.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/46922339134.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/77124806261.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139dc6a75055---8333292487.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/82525240694.pdfIn PDF document text
    • http://sieuthibds.net/images/files/dalenimod.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/nejegude.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/fokaneledifek.pdfIn PDF document text
    • https://slicktechproducts.com/newerac2c/userfiles/file/81572947189.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/repaxagobelabupinupora.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/vosotofibuxaru.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/zumaniwufipawuzirerofo.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/kopuduxabe.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/teniwuwadoxepixeliko.pdfIn PDF document text
    • https://badrivishal.com/media/22379218895.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/14111756608.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dfbe7ba05---20892953322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=download+mobdro+onto+firestickPDF 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_off0000d8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 10956 bytes
SHA-256: 54bd95012fbe0555af1615d230c83db9f88e9254e2a2ea9415282bd809907325
font_02_sfnt_off00010a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A35 17752 bytes
SHA-256: 41d25e8109e629c8364e59217a13a1704d57d6d3bb5014bd6a5104689bd7c4e2

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