Malicious PDF — malware analysis report

Static analysis result for SHA-256 c883cca667f2ebd3…

MALICIOUS

PDF

71.7 KB Created: 2021-10-04 11:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 584eeef05896ca19ad4fbc0c84b1faa7 SHA-1: 8844a6fcb5dfe04f4b2b48bbfed263f2819a4a95 SHA-256: c883cca667f2ebd381b3e70e5ea62b111413bb1cf0c7e85dc0ddb81bfb0b5cb5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613736b483204---furebolobiwisozufexol.pdf In PDF document text
    • https://mimpidia.com/contents/files/buritezuzopam.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161483468b7b2c---jaxadonex.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/75859614819.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/rilrbvg7q9k9r1b2lf1u57t9h0/nodoneperofikoli.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/xiwubobutabumeg.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/82140052269.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/19092237200.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/54244866168.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613196111279b---47771964634.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/59561651406.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/kopadolibulobir.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/bekavap.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/godesivurisunopanekun.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16158572d68501---58619731761.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/39906424057.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/1f76a1795e27e4ce22dbc71a340d314c/mewonepalulukop.pdfIn PDF document text
    • http://dongphat.net/upload/files/wodefuritiwidadofanepoxob.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/82765692579.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f29db4f332---jurot.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/gofosovoxibaletum.pdfIn PDF document text
    • http://geasit.it/userfiles/files/41499853550.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/3408373128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=annotative+text+in+autocadPDF 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_off0000b56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56A 10300 bytes
SHA-256: 6df2b44b1a02e8d5fd542b6cf614b155548da20f29f33d895fac813cad9ac146
font_01_sfnt_off0000ccd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E6 17244 bytes
SHA-256: 0e3d080d1c9702d14fabc12ff85c4ff01c996e89a430c0e85c42635fcf090306

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