Malicious PDF — malware analysis report

Static analysis result for SHA-256 f352e921fcd82398…

MALICIOUS

PDF

86.2 KB Created: 2021-09-04 23:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4fe797b4458b34b27b33f9cb32c6045a SHA-1: efb39ed7d32a0d0bd0942cb15f1fca3ffde7cb0f SHA-256: f352e921fcd82398a011986111333652bdbb59e11d73a8b5f19db7f8b9ffb986
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://catamma.ru/uplcv?utm_term=die+physiker+zusammenfassung+pdf PDF link annotation
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/5e1f568ff4a85a9b0d108a622bbedf8e/gabuwaviralefo.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/nt98epk2v4pesn6d6sfnqnsk71/fujixijidinume.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/49222985708.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/jamopinam.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c790fce609---3112757712.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/99af584ccf565369252f3c6e64a1150a/94994482343.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/wagoxozidupowabizowe.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/96779996935.pdfIn PDF document text
    • http://hevolta.com/upload/file/85031280918.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/bulisozizafiba.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/22425854910.pdfIn PDF document text
    • https://synersys.fr/contenu/file/kepexisidovavugazed.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/wuvakime.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b58ce64de5b---38459082944.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tejeraravinovilopedo.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/laferopoko.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/1bd0d2247bb2a389faa5637302824d8d/72190114430.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/modupizodasewapafowuliji.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607644e899eb7---12389634202.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/xopikikumodorixosepu.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/f6c9027cf30445e499295f6d5277ee93/rumesokezurepik.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_off0000e564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7B 11048 bytes
SHA-256: 92af83a788e10a738f8c6f6465a06f4de5394473b657c44d140ba041b1b853a7
font_02_sfnt_off000116e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E4 20704 bytes
SHA-256: dae0f80b999d59509d96b98f0fb6f7291b7e8e850dbd1fc090ce7d2b6c72f1e4

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