Malicious PDF — malware analysis report

Static analysis result for SHA-256 10e3da8efbed6807…

MALICIOUS

PDF

155.9 KB Created: 2021-07-23 11:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e681778dfa8fd9cd25a9af2c34416824 SHA-1: 819034fed9cb60b08af8387a8ef0135e00855a5b SHA-256: 10e3da8efbed6807daabd5877dad72492a1b9705341401c4632f240d8df207d2
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9706

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://aadhaarretail.com/administrator/imagetemp/file/77470366146.pdf In PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/17585514.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834961e8f78---30327521587.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d92e98da588---sujewovipa.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/vulilepukidifovig.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/6e6fae4c8224f6a46ef0e4428e8e441b/44436099453.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073749baf253---36562070174.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/zalidepolazoge.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc99544ef7---gezasefilusodexerisejak.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/xinuz.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/5759479933cf3ca05036e83c17596fe1/49700119210.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/mafigebumidipi.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/cf99f5c4c1ec80314df4af5ec55bf704/somutanatugelowurebib.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160757a7f45ef2---gafifig.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/barodopoveroleworerarawit.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/gojumofar.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b39fdc8481c---guwumom.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16083f7aa65723---63844790397.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606d18f774a26---gesikanufegap.pdfIn PDF document text
    • http://fittbike.hu/files/file/fivajunobipubipufitev.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d1ae1dd34---zaledawirupomulukimokawe.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfe0d0ee04---88334953412.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/jotijesekitodakawikep.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b167a42a647---gapiriwifiwijesumobif.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/sejavataset.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/6860193783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=a+daughter+of+zionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E281 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001fa92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA92 17908 bytes
SHA-256: a1e41badf1640f8b9f95ce0d93ac254f4018acb92ecac25ba7df7437a435982e
font_02_sfnt_off00021688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21688 10560 bytes
SHA-256: cb7624955204315fe966fc03bf52256aebbb535a103beefe7f779cf80d0f4f89
font_03_sfnt_off00022e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22E6B 20004 bytes
SHA-256: aa945d012d88b17ca21c64ad04eff3a009ab4e162a532e6c121af0c84ad8f9e0

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