Malicious PDF — malware analysis report

Static analysis result for SHA-256 87906cf57af92d11…

MALICIOUS

PDF

86.6 KB Created: 2021-07-19 23:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ef0ff407d07e1de5a50d4ab0d1d47bd7 SHA-1: 49559f543438d38e9fa5c014ec75904bd3dc1e4b SHA-256: 87906cf57af92d11542fcff430c261997d84f9534664cfa9c3b9594f34bde3a8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160837cb6dbc01---8007434920.pdf In PDF document text
    • http://msamericapageant.com/clients/873634/File/vuvipatisabulir.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/94662094101.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/629866a50adc705535e2dc516aabf30a/vepofowikame.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/54269393709.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/41783009192.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bc33e6550---57746786380.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/24738247420.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160908d102e848---vedidonovoka.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/79003156204.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/kironizokobojowugonube.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/96194456464.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ab3b3655e---71146849533.pdfIn PDF document text
    • http://safarang.com/basefile/files/66929595559.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/75218249910.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/25207243957.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/lizederegorajutew.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b61ade8097---sabilebaxabebozo.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160735575402a4---87413237288.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-14/20210614155306321419.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/7958027659.pdfIn PDF document text
    • http://d4sontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/fosoxopipinasot.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/bb5048ee6fa21b4e1bc9dee58439c8a2/23086068565.pdfIn PDF document text
    • http://ipublicity.cz/data/file/bapuvugamegikebuvo.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/tazoxugovuritu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=who+rule+the+worldPDF 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_off0000effe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFE 17976 bytes
SHA-256: bf4f5d6abbc52f2283c94d52d5f6a7b0c36619bd9920fe3a18e1d0120e5df62f
font_01_sfnt_off00011ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E0 10000 bytes
SHA-256: 21ba75b5a17672f064de65a7a5e611fb9ac312bb0066a8994797d894264ee53c

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