Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3d66c4dd628b72…

MALICIOUS

PDF

95.5 KB Created: 2021-07-24 04:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 127d686d7bce66ed92147c05a3a58c15 SHA-1: c832b7d8a73ad6461efc90714145055ade873e90 SHA-256: 2a3d66c4dd628b72db5bdd305d2f50f64590cd8ee41f8e77b8f52058b5a48274
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links to compromised WordPress sites, suggesting an attempt to distribute further malicious content. The presence of a 'Password-protected archive handoff' heuristic indicates a common tactic to bypass security filters by encrypting the actual payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • 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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a9a938e61---lupalalijenanefonepijewu.pdf In PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdc034e710---birutovajines.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/fc6975af9abdf42eb6b0cbbff7fa52c7/99975939103.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/51884547416.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/xaxixawesemidupu.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/61150870772.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/rejoxoribev.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c97e3c842f---38336286022.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/giwinovuful.pdfIn PDF document text
    • http://focostrade.com/files/20210705064307.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbca6a1626---66263314789.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdc9c8e046---99497180382.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736720358dc---64180460996.pdfPDF link annotation
    • http://bluecars.pl/userfiles/file/17755343788.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/12492460603.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/4b9860f928ae33388c2521cd1d666a42/xuson.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/duzite.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/60744679726.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606e850acf19c---lovabifazetovovezifewez.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/18472015955.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c069ace87e8---jodusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ciencia+e+ingenieria+de+los+materiales+askeland+4+edicion+by_arkanosantPDF 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_off0000f132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF132 16404 bytes
SHA-256: e6f5fe0f052f2206c997615b87badcf8a5ee19c0ccc5d59d192f398b3bdb4c0a
font_01_sfnt_off000107aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AA 19500 bytes
SHA-256: c7b70a1fa9a58bd92e58c9d6b7e45fd4d065fa9995c9b3fc36bcf66930f0bf47
font_02_sfnt_off00013a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15252 11200 bytes
SHA-256: ee753e2671ec255f42c219de691a6dd5b834ef43b64aba539b5d4369e4d31ae4

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