Malicious PDF — malware analysis report

Static analysis result for SHA-256 37847d76317806c5…

MALICIOUS

PDF

85.2 KB Created: 2021-08-15 07:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3f05b192368b174f1a4a06efaa1a8e72 SHA-1: 20163ebf47492fb6601e802312590619b0cd6e50 SHA-256: 37847d76317806c5828f49c2e18b2c6da4a6c111c4f95b04207485d3782c4b53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nsdadventist.org/FCKData/file/53543176082.pdf In PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec50922c0a---kabazesajow.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/10m01o46fr9dffekgs8u6bvs0b/mupikezuradajiluwebe.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/fofulejazepi.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/dojuxurolikixul.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/bb81cf74857a09810749db526a96bd5d/zakiditinaruxup.pdfIn PDF document text
    • http://nakatka.com/files/file/36346577074.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/47acotglqic4um8mf4cn7ijlig/53551887140.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/mawafetezubaxefutenepi.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/getafajomuxej.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/winovar.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/9971633166.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/ddca7d9b5a159feeb6f65552e2fcd23c/daliviviwumafalifetezux.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0936e95875---64358373358.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021052705135073499.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885fc9d4dbd---rigediwidinibu.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210604143130121.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4df7a5e03---73753266298.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c883901dc---6820081589.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a6f80ba7d581ccad1097455df1448e34/budategepavaruvira.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/36177333225.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/4d3c4e74b1fca62a9ddda5aba3039806/60057603048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=bancomer+california+chihuahuaPDF 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_off0000d258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD258 16132 bytes
SHA-256: eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8
font_01_sfnt_off0000e7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C5 17692 bytes
SHA-256: 47a50c80fcdedcee5847be0b342b8ed4ef27d6232855840c1df1f60d262cb877
font_02_sfnt_off00011489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11489 10488 bytes
SHA-256: 92739057a6f6a91643f987fdc7c0b2937d323d74f23b20e00b74520356b97009
font_03_sfnt_off00012c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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