Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb778490f1c50438…

MALICIOUS

PDF

86.1 KB Created: 2021-07-13 06:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 00104cba9c12d4c9d434c2b3ee9a98ab SHA-1: d9f8f3d4ce78c9ce48242fbb0f41a82b56d7e780 SHA-256: cb778490f1c50438db2aa864e5b0b68b3857347d7f9180f229ae15bd640026c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=call+of+duty+mobile+redemption+center+not+working PDF link annotation
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd69b34fc9---vimusiwuzore.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/38987075967.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/nonipabanazojuzitasoro.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/zuxed.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/b259b490bc71cfba67aa57c3d9ca93ff/65701073533.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/gesenotukapolukad.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/lubevuse.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/15830350130.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/zudetukimuvexexuwosaka.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075250541c93---95966600250.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/medikulojadipositabuzu.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/mopilevujomememuti.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/piderigaxo.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/75384022128.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/37d54698ef9fb3a1740f0174e1ee594d/vafujazomidezobidudixo.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/lekexugur.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/27641506179.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079a6891e2a5---90823583735.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5a0a241f3---93927065184.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160970d16d12e4---90038617471.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/c0f798020489ed1d252fd2f5e43c2a2b/risimufopuvixiritosulaju.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf455d7a971---dazegexufab.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791a3469b10---62462718977.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/mofikumarepib.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_off0000eb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB29 17292 bytes
SHA-256: 1631fbf623cbc56668ce4b151bf01c1b33fa73aab3d5482249bf19375657af9b
font_01_sfnt_off0001181c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181C 11360 bytes
SHA-256: aeaa2d77edb852050ffb9335a148ad41e49cd87d221d8dbfc8e724197463f938
font_02_sfnt_off0001328e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1