Malicious PDF — malware analysis report

Static analysis result for SHA-256 af30302be910bacb…

MALICIOUS

PDF

79.9 KB Created: 2021-09-05 13:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4f62ec9c7fc4e4ad38cc7924e323beed SHA-1: 1e7555bc9c8c3a1c744e0a3c3207db24c9c7ff41 SHA-256: af30302be910bacb6462772798bb17990182b6c9e3d97705b5eab51e2b9daf73
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload sites and disposable hosting, likely to distribute further malware or phishing content. The presence of a 'Password-protected archive handoff' heuristic suggests a common tactic to bypass gateway security by encrypting the actual payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://technestudio.eu/userfiles/files/sitozadipotipokagexo.pdf In PDF document text
    • http://kursadowicz.pl/Upload/file/47934191296.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/14piaocah1utjrejfmdss1vnvl/numiseguvovuxusazipifozuf.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/domisoso.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/37356003279.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/8278e5773b2e79f4fa33d7717fd7bbc6/84937979404.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/gonezibumigisazufolew.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/21544770504.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/q97itnjgplner02annd7qc7oft/rekezipuvoxogizataf.pdfIn PDF document text
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/gamunorugimumolupumiboz.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/nld47vkddso2rgtukvd187go06/jubetirulisuwuv.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/36858678334.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/f5c4667ff75a5c8eac3a5ae4026a500e/62490890355.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160959b867aee5---lezogumaber.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/76877739116.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/seboletasofixaw.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a239ae77f7---kezujunoxemapesebuwatogep.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/16538468648.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac508eb26e6---90190808798.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991f8cf3dab.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/lasajumizinexama.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebcb7d2a08---jadupilegotozixenogur.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/tetidibedik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=como+convertir+un+pdf+a+una+imagenPDF 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_off0000d29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29E 10948 bytes
SHA-256: f787a3abc6ccadb98c3c9771ca804d483047a14cb00e1dfdbf27053d5493f96b
font_01_sfnt_off0000ebcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DF 18392 bytes
SHA-256: 9f50af804dd0507f050b768b0014079e097a410dbd10fe9121a65adb3b03dba5

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