Malicious PDF — malware analysis report

Static analysis result for SHA-256 3becb489c77ad8c9…

MALICIOUS

PDF

71.6 KB Created: 2021-10-01 07:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 69b64005f232e167056adaec2f147ac2 SHA-1: e8a1a380552e0ba35c2976d3cfe3214e0d4bdea5 SHA-256: 3becb489c77ad8c96f071fae5822a67431f7fdda8fd6c88db5c53d738debaf20
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be acting as a link farm, redirecting users to potentially malicious content hosted on various external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://studiecarriere.it/uploads/file/xudivuxoludo.pdf In PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/9039078738.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/daverejuwukusawasumu.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/fojasemubododijupenarara.pdfIn PDF document text
    • http://montesantangelo.it/files/files/87309936923.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210911235115.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/44505535258.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/96004818695.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/87812483863.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1632507449.pdfIn PDF document text
    • http://ip-kamery.cz/files/file/xuzun.pdfIn PDF document text
    • https://mots.alaxarxa.cat/cmsimple/images/file/13209563083.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/8hqev788a2jj58jnj3ivighpoq/30846952290.pdfIn PDF document text
    • https://kultmotor.hu/images/files/vutoxos.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7b925d825---gidipazipezogoz.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/54751410723.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/72845579695.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/83242461478.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/83870565092.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/dozosezoxipu.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/pudutuxewapojefelu.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/92787153984.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/jepuf.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bcfbb77fc---vixunimugelojexifago.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/8e407a65e8629ec87f0d677f5c273e4e/fatasot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=synthesizetofile+android+examplePDF 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_off0000b165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB165 11116 bytes
SHA-256: 6c2acbad793e8620380f188397855707958e38ec7a99546a8a5f81c5f3bad16b
font_01_sfnt_off0000cb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2D 17524 bytes
SHA-256: ef0ee32cc6566339f0fa4962f21450e5c963039e987dec0eaf415c39159c83bb
font_02_sfnt_off0000f880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF880 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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