Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec0087b1dff297c9…

MALICIOUS

PDF

86.4 KB Created: 2021-07-22 03:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 517faec2bd0608bf1c5dee5127337a38 SHA-1: 00929612550233ea17a0681aef39306e990ede49 SHA-256: ec0087b1dff297c969ce72daa1559ad8c7d2ffe174cf9deb9cb9fbc108890109
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The primary attack pattern involves redirecting users through a series of links to potentially malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://xiaohecollege.com/d/files/93911512094.pdf In PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/ac77vno6o0trtc4tfef6ct8dc1/berepidararewev.pdfIn PDF document text
    • https://advik.net/userfiles/file/toresexokigisulunadobavew.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16090d75c4be5f---taxedat.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/058225595da1ea294dccd254aea8c56d/piripuzatedifotugolonap.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dd67c4d17c1---70730389438.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/dcc4bc236908d7ad5164b2d3749c2b98/1877948831.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdc88ec41d---xenorifukixupuzojejorumet.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbfd7a4e5e---kalijoginaxozonagafoj.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/cl92f2fi3k1tpnbk143ve07sjq/wanogazika.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/hio41f5m22jdkb4sca0n2l8td5/22239921201.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b01426b3c---nikotifimalodu.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/12402934951.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8da6bbbe4c---nevavezefoduwen.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160989957e4350---9419383505.pdfIn PDF document text
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/pupakekudulinotarufodavi.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/lidokukelopuzele.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/f43be7fbb91fc8dbb9ad9d7e02668413/supoxenegogetawaxuveguw.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090536ba4eed---favinom.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/kidibi.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/91753609894.pdfIn PDF document text
    • https://andana.us/files/files/sivipelesusolunumon.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0sme81eri33kerq9hbfdbtlk02/sawipixovimomobo.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/b1e17156306fce9da290e8a0fc62282c/49741625356.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=111+and+1111PDF 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_off0000f21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2F 17364 bytes
SHA-256: 1cf14e6cd97e4b56eb5f4a01554394c8337d992b66dd100f3738d2144e1235c7
font_02_sfnt_off000137c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C7 9440 bytes
SHA-256: d8683aa1021315b945221da1d9edd5beb195fdc9372bff04346275b90e2c26f9

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