Malicious PDF — malware analysis report

Static analysis result for SHA-256 96780d0a734a4357…

MALICIOUS

PDF

71.1 KB Created: 2021-09-04 20:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 384e508b196f9d22117c9f299f75ea48 SHA-1: 6c1685ccddc357608a0ee9f2461d6b314c757b3a SHA-256: 96780d0a734a4357d2b960230c59f1f567a3b8fcf13551312baae22669f9bc79
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised WordPress uploads and other disposable hosting sites. These link farms are a common tactic to distribute phishing lures or redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=client+centred+theory+pdf PDF link annotation
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/53501223543.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/3j6u2il0ai0f2hmru73j52u3c8/raraburiz.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084796936207---64380386526.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/tofojomejomevo.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/31424939977.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/geferukemaxe.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/3694666626.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/fabifafifunivuk.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/34124718867.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/pogasisimu.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/gagapo.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/xileramij.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/33569006468.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160963af743777---2848359589.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/35352870145.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6355cc5b4---kejetajexakitunanuj.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4328e9d32---86930255789.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161051e4dec982---denarilalilizop.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/68425770343.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/28336247777.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/scj0ae1ev3b4c1uvbjtbl2eg9j/polukegivugazewogorobu.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16083c14e55622---58295126350.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/v22mpfbkiumbkfnsghkuupss0u/sagigufewadi.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/33197087488.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_off0000b92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92A 10532 bytes
SHA-256: 1b952efe94e5895badd3fc97e0d8e85d6f2239c9c5d68404dc08c12aea6ade66
font_01_sfnt_off0000d110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE922 15024 bytes
SHA-256: 8ae1948e97e160480938d49c99a98911f688d42ad4aa9815a86c8aac62d42ac3

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