Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e9601388b7e73f…

MALICIOUS

PDF

112.2 KB Created: 2021-06-28 08:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b186baf21d4040ceead54f1386b7c3d7 SHA-1: 1cf95378f4a5f8ff2aac0d3af8afd4c094f9489e SHA-256: 36e9601388b7e73f660573997506d9461f7b83d24bb1ece6f02716695661b985
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL findings point to a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9729

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844e5599ecd---85323035134.pdf In PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d02a806a3---niratajigagare.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/watedibagewi.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/22296721275.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b804526a41c---wetevalefabibijaginowim.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d7555566c74f34f3947ab82f395f91a9/41005706502.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afaee4eb89a---zorosididape.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/bdffe6e1969e803489cf2d844e9f5a26/pubat.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/badce22c8f6df25aca4eadbb16e16bb7/14973848787.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5cbc7fbbb---67559449262.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/39kp3tl9cmlka6ujacqqfbg8n3/66162230772.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a74b9bdc695---luziwilujiguxupifinu.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/nruhhrafnup2l3mgqb1os83h6m/43187418515.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d57bfd2ba9f---vijawuwopevofuwesuvivuw.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4c25010d8---46701982876.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/62570265215.pdfIn PDF document text
    • http://atek-ent.com/upload/file/36898049436.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/sezuxatofo.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b404205c20d---96347052044.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/9b36efa1a1c63f757b4b07e88c6b064b/80208921966.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/92425507227.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/5927588682.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608494cb235f4---99070285063.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d83574835---mojewatefepuxor.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/sodunaxusikomolefifidabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=dihybrid+crosses+practice+problems+worksheet+answersPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDB 11212 bytes
SHA-256: bd4dc2fb911aececb8e5de3e319c2474054219d5c461d076b6abf06c61ca451f
font_01_sfnt_off000139b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B8 2084 bytes
SHA-256: 010289410b2f7cd03359e372c9437e37932fa53ca3db8adbd9cd49af62a499f3
font_02_sfnt_off0001432f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1432F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B41 22928 bytes
SHA-256: 62de868611fc1099564c82e82772db269b28f93f8fab7552630e5e7ddd2d5157
font_04_sfnt_off00019801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19801 17264 bytes
SHA-256: 7aed5e184921cf6d33dd0c3957dfbf71b874b4a2c04b4ba4cde05630ad5534b9