Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1fb4b352b638e6c…

MALICIOUS

PDF

123.7 KB Created: 2021-09-02 15:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 269a7ad5fd350903b6f7e0a5b1037f11 SHA-1: 6a641e6ddad6dc60bcb0f3bce22ec25e6fb75efb SHA-256: d1fb4b352b638e6c74637e41a8244bf217a71376a7d6b55d1037cecb6a728e96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://synerhu.ru/uplcv?utm_term=continental+drift+theory+worksheet+pdf PDF link annotation
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a34e7500347---dumonojezijuporekeladaz.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/xopazajuseta.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/jiwazutosodijuta.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/58883410296.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/695ae603942d0f3e7b26cf0ea2bb7980/reparimomademewinar.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210726130607_1z13vc.pdfIn PDF document text
    • https://phr4u.com/files/surufojugawexizu.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4449a55be---xudikumimafurufofedewido.pdfIn PDF document text
    • http://sgpeo.pl/users//file/rozebozurupuxisusuxow.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077da80944b1---11853788710.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/misikikujinefaxozozovemu.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/17275063775.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/gowokuk.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-8-1/20210801051856595742.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/77394687020.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac11c1e1e0a---96128850367.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/a2496ed80f36e680594d809baaea8e55/pajotis.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16124ffb018923---memunagujozodawipufinabu.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1610b0e44894cb---jotesaj.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/40007768452.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/kusatafozik.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ac9aec66600e6abe20db22d628f55365/85055259852.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_off00017d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D4C 10916 bytes
SHA-256: bd9056dbc1eaa67e696d83d1cea46c40bdaae86715038465c522c281259a1572
font_01_sfnt_off000196a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196A3 19644 bytes
SHA-256: 4905585a6d66c8780fb2edb34584c322ea7933e9a2252d1cf35d49d3462becbb
font_02_sfnt_off0001c8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C8D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.