Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8bb34ee2096763a…

MALICIOUS

PDF

90.1 KB Created: 2021-06-27 18:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3f38939377a47e972d43bf985782122a SHA-1: b2a56e954b9097b3fdc5b0a9971c1ecc1a6a158d SHA-256: b8bb34ee2096763a639a6353b0a979447c0e83d13ff4cf2d7627445812b2eb60
156 Risk Score

Malware Insights

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

This PDF document contains numerous embedded URLs pointing to compromised websites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to manipulate search engine results or track user engagement with malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://allytemp.ru/uplcv?utm_term=asbestos+can+cause+which+of+the+following+illnesses PDF link annotation
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/05091e0444163e0c5e9ce1ed5132ae0b/zefekenesipozurutupezupil.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/divupesu.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/75750802898.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/nagavinev.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d08d4548b2---43758832163.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/hbjdh2j9p4q7d7aju3e8mn0tlo/nufulawukomakezef.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b88e38c7731---5157842368.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1e817a2f4---96774812986.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/72090817103.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096c94926604---jutekurok.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/5jvrti37vf3p2453ttjueqkdge/78506647264.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/kegasefuwit.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c001a280b27---rumavati.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/059172dbb84e134788286a876690c693/gilopoki.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/86641112569.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/112eab59a3fbdd569c2bf4381d0b93c7/85761474245.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/82d7ce1d79dfffe6905f16ec8e687858/16193120396.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608027ba16e86---wafezumedaxur.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32b4b12c7a---wekib.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/daxelodikupafigozorux.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/fopobanawiwega.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4d0e4849b7382090456d5234cf293b47/logugegejezudenaritaseme.pdfIn PDF document text
    • 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_off0000fd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A7 16900 bytes
SHA-256: a36c6e2d307d4c0e5e10247c9ed6ceb97ed2e7286eda4ee07473fd7303c95c0d
font_02_sfnt_off000141b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B8 10824 bytes
SHA-256: bbdc95b9fde2e3eb115040535249b0854bcf0ebe6e958d1dd07da0c135d79f7c

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