Malicious PDF — malware analysis report

Static analysis result for SHA-256 05906d63819dc9d5…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 17:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 684470aa8fe82cd71d0cf12cc8309b82 SHA-1: 7b47c74ff75cf6f4d12d8e6e92992680d8799323 SHA-256: 05906d63819dc9d5094c2a1bc1860bffdddbfa1f8f42cf7f1f0badf9164f2332
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing sites. The PDF structure and link farm behavior are consistent with phishing campaigns that leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://rlmahtani.com/userfiles/files/76202650320.pdf In PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/25fb123573d834ce51c1523295dc6706/regowufipubujawozex.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/of80vc1gm66fubg8kk8v17cppu/boxuvemit.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/3755231213.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/62615220689.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/64316609629.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/bivitofaxuluxejutubev.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/66981975705.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/ugbhvu7bfci52cfosee2e8rjl9/42181186574.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/66197629783.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/refev.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97441917835.pdfIn PDF document text
    • http://come2menorca.com/images/file/92414191765.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5a6357df4---79114594771.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/6e531401e0e2b0e174e8182bf66c16ba/36013454523.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161258f84463ce---73876968710.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ls3ukrevjn58iilgng39g5jv81/nuzerimumumumale.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/gt6pscpv1176faa9fg9sadinj1/lofas.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dff0c36ac---97011771265.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/67361902248.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210621_07F4781347FDF19B.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/hlol846d94pqloser87sfkqrnk/46421814029.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/b109aa72f53613a71cf1255bfab394dd/bidalomunow.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cb670dc73---41590951098.pdfIn PDF document text
    • http://genia-groupe.fr/images/files/66387761060.pdfIn PDF document text
    • http://sdes.in/uploads/57989548623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=prepositions+of+place+exercises+with+pictures+pdfPDF 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_off0000d9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C6 17944 bytes
SHA-256: 548be5ef613afede241ef65ada5463e021a7a2b5911c4117e81bd2ee42838af9
font_01_sfnt_off000108a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BF 11008 bytes
SHA-256: ba43160c1d4fa75c7a3b62ebe14742d1db1da5362233cd28d42d2307b2d7f36a

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