Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac4f636bfe7e489…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 20:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e2f1adbe3dfb158c9745c158e99f53be SHA-1: 632811119845cfe0d1e5bb0dd59c0bc55891edb5 SHA-256: 0ac4f636bfe7e4894948fb54cf3193b451caffe6395b77db9d95cc64f77e712b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95', indicating a phishing or trojanized document. The presence of a link farm on disposable or compromised hosting suggests an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4269

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ad0cc87cd---lifawibasovosew.pdf In PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e260e1d7326---69779126733.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160937e9f2e78c---jisusomovusirabapujaxix.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/75118309551.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20218291356256207.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/23178b23c224a44408b2fe902134e59a/78714387869.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2952a6625c---rezuzavewavoxepo.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/66605181907.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/92052687445.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/zexorilejavisaritub.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/dezexogijomumob.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/80683075068.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f778a6e2a3---92835266443.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/89078004306.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/21924119636.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/161654705182ef85902ee05b06f75415/bumibomatovidevobolupip.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16076c17a62e16---navanuwonoko.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6217ec32b7---28832649891.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f0a411832b5b2909d8a08d0552d3b81e/bemidibomaxosemos.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/21c088e26ef4fba5886282920ee042b8/47318503974.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/kilezege.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/c8e7f98b89da465cea93fc91616dcb57/vetokefenabine.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/928e853ef6777270c65d6e4396cf2237/mijured.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/kojasujirifujalowekajavu.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3c84f2f0e---fumanisatun.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/sodamipudareluzaxareguk.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/819730bd678e4af605ba53b1145e6da2/junelomosisaru.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/5197959556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=rrb+mumbai+exam+papers+marathi+pdfPDF link annotation
    • 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_off0000e984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 10880 bytes
SHA-256: 38909d1c2808dd1822a514f92d89fc12cd792d05f6eb31329555cbb125a37df5
font_01_sfnt_off0001027d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027D 18300 bytes
SHA-256: 06fcec966080cb46c68052fc83c7dce18262272a6ddba026d77f44c6de2b262f
font_02_sfnt_off0001324a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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