Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d601ce0203c7498…

MALICIOUS

PDF

92.4 KB Created: 2021-07-29 22:40:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 87d7e01bb0299acb71cdd98ab88bc31f SHA-1: fd6c3e6f337f364ed048840fcc06b0107eefd5f0 SHA-256: 4d601ce0203c7498787b3f2f8b81cdd5b555d41f9f3cceb5f1c2cd85cbf23555
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads, with numerous distinct hosts, suggesting an attempt to distribute malicious content or phishing lures. The document body was unreadable, but the presence of multiple URLs pointing to compromised WordPress sites strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://bassbasement.org/userfiles/file/fakiguw.pdf In PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/agsh0j0jc440vru1cvoma8d1qs/xuroparazatunufugiwudux.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608671652c2ed---13687951293.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/f426ca9db845932e925b908ebdbdc11d/98565578618.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/g63kb7ch7p439smqt6c4ij3un3/68270396683.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096097eefa7b---juzijukuluxowi.pdfIn PDF document text
    • http://elitvorota.ru/f/file/41825295711.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/foleretogutikejiwozimiraz.pdfIn PDF document text
    • http://barksdalereunions.com/clients/869108/File/modowizepo.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/dezunapedobuzab.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/oalm4d31dpoiik724f5h04t19g/lavazolagugalotefejun.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/8af375f2480afc8429fb3327d1a05751/15630108171.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/78960081754.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d85d5fa6---6927056153.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/filupiwoximeguk.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/solab.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0b503ca8c8b1528ddb48e8c7de8ed162/jusuta.pdfIn PDF document text
    • http://xenangheli.vn/public/files/40080608613.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2edb3a8b1---14340155646.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/kalufar.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/sisifuvakojawodonid.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/65bfb1b56358a5fcc635d6ee9613c56b/30483436313.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/1e4a6b1699c230131f7c61e2a00a9c6a/gonupukebade.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/50ec43bca5c303990fc79ad1fe3b9944/3039114603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+are+the+types+of+creative+nonfictionPDF 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_off000103b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B2 10704 bytes
SHA-256: 92fdf4e8a779fb5e9d0b11daa21eb28df3af6ad176d5a72cea30ced6b6cd7374
font_01_sfnt_off00011c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001345e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345E 17604 bytes
SHA-256: 47dac7fc55d7c1c91082a117a3b53b945f505d33e2b149ca7e481b754fbce23c

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