Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d9173e35f4d9b6…

MALICIOUS

PDF

86.0 KB Created: 2021-07-10 07:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6def6fda28a58557177eb0d54ce2807f SHA-1: d363559de57d4c4ad8e2706af4d8a464cd519209 SHA-256: 11d9173e35f4d9b6ace3d08a88d62104a5d0e26bbd1bb6417d1bb186ae8b0085
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to malicious websites. The presence of compromised CMS upload links further indicates a malicious intent to host or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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=man+of+sorrows+what+a+name+chords PDF link annotation
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39554da889---83694758935.pdfIn PDF document text
    • https://yuss.it/file/36679451848.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/nexowilebejer.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/a5f518c362ad374561e8c2da524906ef/29084829269.pdfIn PDF document text
    • http://iphysiology.ru/upload/18678344152.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0db697284e---84103529977.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/29aada5bb85c06c4aa4303e3a3489da7/jujokatiduvawimunoriwonu.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160928d2738380---xexofinenipi.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828621beaf0---5553914565.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/lomona.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/20567705253.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b1666b9c27d---99951973105.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/3ffd58d77e9f7531e317d77ed007903d/girurevupodoverepozus.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/tojovesososiriri.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb988bbc67---nixujojaw.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16082be0411c4e---mukasanewut.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/68926457142.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c247592dd69---45404070354.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/94464f2e53ab502df7eb7fc3419c8035/towujodogasafoperokaxobot.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0606789001624226085.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/joxeribikudazifegowiv.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781737e9247---21108122184.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/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_off0000eb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB81 10684 bytes
SHA-256: 88bd4ff90e1eecf7d7dc0c1275abfa8c362b34196dd470c6573ceedd7925ad8a
font_01_sfnt_off000103ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFE 18448 bytes
SHA-256: 2d1b290a6bbe96d07ed83643014bc9024a3471f57acc35780c46223f08a828b5

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