Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f621b30dbb29435…

MALICIOUS

PDF

87.0 KB Created: 2021-07-17 13:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20ea2975a314dc7c3050e1687dc587d5 SHA-1: 82ed474d1a3888a12ec1ad0f227dee6670da3318 SHA-256: 3f621b30dbb294351c60f6af03a8bc08bbdd46ad83c92b8128862acb51edcd3a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on potentially compromised CMS uploads suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607745da67d17---52911989929.pdf
    • http://aweibel.com/Photo/file/jorujoraguda.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2154b78db---diditipiturinurikofuxuriw.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609249b8ca5c1---weronus.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f655654424---lopipomo.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/dk2od8mfckhp6gie0kh32n3mu8/fiwonemejasosati.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9939beeca---zijapuzolotivupebaza.pdf
    • http://takemehometomatoes.com/ckfinder/userfiles/files/pewejofubitudid.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/c8c1e556d0b20564c94d64bed1fd125a/dipaw.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/9f567fdc970ae2edf4a5d2064a9fbe5a/veraxupob.pdf
    • http://hintzfamilyreunion.com/clients/1/12/12a2788c5de59b93c87e4eff35998d4f/File/bofezovedizukub.pdf
    • https://aslimitada.com/userfiles/file/sokivevewapasigatata.pdf
    • http://helderlive.nl/ckfinder/userfiles/files/66125398932.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b10697d14---29663114676.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d667e485dc---88998463412.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/fmfte90cvqiojneaigi8ped811/87504249112.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3e1785cc9---sirupo.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a17fcaeee---daxafozoraguwatepata.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bea8aa86d8f---68832043020.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f24fa0d0a8---jedubonibosowilume.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/a1h1b2bnntsqaicn63kn58j9k4/giwokowogosadunugopo.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092185a42f3e---zuresamupowufe.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c586deea3e0---44821167842.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=a+series+of+unfortunate+events+the+series
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f235.bin
c9d7501e7048beb1d83ec3e433b3a816f3ea708765c6d533a5ce4e984e537559		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF235 10412 bytes
font_01_sfnt_off000109d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109D7 16792 bytes
font_02_sfnt_off000121e9.bin
70bee58ef675eeebb9a4e831db31878c145098bb3ddcaa668bbc752d5c60a176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121E9 17428 bytes

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