Malicious PDF — malware analysis report

Static analysis result for SHA-256 3634fd5248b3ef92…

MALICIOUS

PDF

84.5 KB Created: 2021-07-09 03:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d5795d5c7d06d69a36f5f33a1cd5c563 SHA-1: a22a0e5a5786b5db8cb344b22e0a6c3fff666b90 SHA-256: 3634fd5248b3ef929eb2f00cefa4feab0f7aa82949bd4ebf42bf1b7153c89a12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm used to distribute malware or facilitate phishing. The presence of embedded URLs and the nature of the heuristics indicate an attempt to trick users into downloading files, likely disguised as software like 'windows 10 pro iso file download'. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3116b4221---sajedewukamavur.pdf In PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700818d995c---24775599656.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/widotinimozevukedep.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/15831764324.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d00c9b307d---53640208714.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zuzabozukezubixovew.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210526125239.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/b8d312abb12a918eb44cb53331df25fd/viralowajakozobi.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/83677032468.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb68462182---jewuti.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ls6f7j2bf9hisga6m50rfks5g7/xarivuju.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/f94fe22982dcb70aa04330f0dc2cb48a/pozamatoni.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83af9842ac---34663686346.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5663d3d90---rovaj.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/zonewejaf.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/krkensgpr6gcm6lp534lafaev7/11481428458.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/b43df58700b112c17df35c60f605048a/gejudadefevipidalezu.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c884c653650---nakejalakosegagidinonaviv.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/76894765794.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/2819034bf465e404dc2f6ad89fe567a9/67969452469.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/17128459119.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/56395560792.pdfIn PDF document text
    • https://olterus.com/contents//files/61184555628.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/12647178455.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/xajunasizofaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=windows+10+pro+iso+file+download+2020PDF 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_off0000e7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B0 17228 bytes
SHA-256: 3f8da6454d01480111b109fdb1c9b82c5cf1c7db02d485bbb224a046223660de
font_01_sfnt_off00011366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7D 10768 bytes
SHA-256: dba70aff5b928352e94978f9b30f4aa9b8e5f12fabf3c2d736ba9d058f81eb13

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