Malicious PDF — malware analysis report

Static analysis result for SHA-256 5982913932aaaa63…

MALICIOUS

PDF

88.7 KB Created: 2021-06-28 05:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5fc93376ebb7b554edc91d0a02800b12 SHA-1: ee3f5c9324c9b15b1fe4c0435cafdc2eb514e722 SHA-256: 5982913932aaaa6379e3906b21fadddee531e212fd11c276c4b208c3a15b48e2
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites utilizing vulnerable plugins for file uploads. These links are structured as a link farm, likely intended to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d35915f78e---54323321982.pdf In PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/m6nh5e9baghhkifrjh2vr84bh7/21316709874.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/004ee9e6cae8452740935077f22b0b13/33444469765.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/67691366016.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/deqcmf7fijvh84jphv80poink6/zirunavegag.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/794d05ccbb39f676d2ea1b4ced4cf90a/75080542837.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a650adf045c---47046272634.pdfIn PDF document text
    • http://kleiberit.ru/files/file/zeputiledeni.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/50fb50077f3b39f1c7fc6c072c6c68fa/tazisiwujakeda.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-05-26/images/files/vijetebotulup.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077dd962dd7f---3163419364.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/3768d4adbfc1ecd51f75fb3e98f19ef9/41744688384.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/dc842379a92a8b62febf8d4a5dbe19c0/kofurepamejaretowewufup.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b995e1d53ae---texabajo.pdfIn PDF document text
    • http://salt17.com/userfiles/files/pabaditemojura.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/19978290858.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/64932853389.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/d8fd080e2111c593c518581201a5f96a/vowibagaworolotewidus.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/d01dk9cjf09s2ogv86ter65tei/misibugezibalidufaru.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/18d34d733e18effd64c92e1abab8a6be/93676667476.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/sapagirigupowo.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/e7c914c7b3ec003b597f15d72dbdad12/35558597846.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec6778b57e---47707086477.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/0d1b94ae964c630ef8b621e2f0d468b8/28258274873.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac746f4b73b---21391334417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+add+text+box+to+photoPDF 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_off0000eefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFB 10296 bytes
SHA-256: 43b21732bdc382f0490cd1f53ec0516b9514cc33f9c4c495498d9b0a8b72bb91
font_01_sfnt_off0001060d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060D 17888 bytes
SHA-256: 3e716b2070af4eb572c7e585c3ee18021b69bd5cc0bba5923f210169171c5845
font_02_sfnt_off000134d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CDD 1696 bytes
SHA-256: 28c5bcedffb0f63c0f18ed07264126f7c833899b916de9a351f9850be7cb6bae

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