Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4cbb7c7a980e9f1…

MALICIOUS

PDF

86.2 KB Created: 2021-09-03 08:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c86782ed7a98b7a0f523de9c1984e558 SHA-1: d5a9f079673a56c7eec5f95352bc85f95942625e SHA-256: c4cbb7c7a980e9f10dce5dd7dee3d7cd035a3c5cd65da362011f095243218ba5
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm intended to redirect users to malicious sites. The presence of these links indicates an attempt to deliver a payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://giant-nano.com/app/webroot/userfiles/files/texojilupafetef.pdf In PDF document text
    • http://hilimall.ae/uploads/files/patasafamafujudetimapobu.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/lonepukux.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/pazufobobi.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/81264346116.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/33367012540.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/379rjss17u2trm4tf47dtl9fiv/69464113285.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3398498cac---93536431461.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/nuxolire.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bc96f400d---tolikexewakuzalapuzu.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cc814268dd---64687505341.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/98049169404.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a42c6df1a---pijixawonepesaworoboned.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/logiwok.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/3540794198.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3174cdafa1---88754356702.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c307142f3---23454623599.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160badc09ba418---kadopukokiguwikonigimip.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/rokedidedufakes.pdfIn PDF document text
    • http://edison76.com/clients/5/54/54c13950cbd15a81e6fb4362eab8f273/File/livejipavasuzuvaze.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/34b025b9db1e1f8cd2abd4cb94d5b9c3/5227242029.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/suwuzapuximorulaf.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/55bf090395f5be80f7fffdf850d12ea7/kovijozorelevepawokes.pdfIn PDF document text
    • http://mayjack.com/upload/files/16448060568.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/bozojibudibika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=zia+ul+haq+foreign+policy+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3D 10956 bytes
SHA-256: 2b2b3a8a2086edc3f0b176eb4a293e9bf9fa6adbcba2d7f781477ad73af88cdd
font_01_sfnt_off00010805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10805 16492 bytes
SHA-256: 67a012b6b0448f919a46b2ad623cde664a9d0430425282f6fca22663bc2ac90f
font_02_sfnt_off000132c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.