Malicious PDF — malware analysis report

Static analysis result for SHA-256 efbd769050c2894d…

MALICIOUS

PDF

114.9 KB Created: 2021-07-24 02:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1a0ae62f0afa71923adc4c6dc5d7d863 SHA-1: 2afaa2872a43a69042c280ed1b2f3373fc7e90fd SHA-256: efbd769050c2894d8af9923ffaecf80ccdc7cf95787edc4d0c314f20bfb6b62c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b41921e211---20462812010.pdf In PDF document text
    • http://pogotowienaukowe.com/Upload/file/60036887807.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2a8e12b0065595cf8a2a07e3fa9272fc/wufej.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/cqqflvghurpr08c4k6cujaijsg/76289857307.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/lovezafubebitogeg.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/f0737fbd044f26b6a6d8ebba245f3028/88062557583.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/71870495071.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/tevusugumapewunuvelu.pdfIn PDF document text
    • http://954move.com/clients/4890/File/61661623164.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/sevaninanekuxereniwutije.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1622977116.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfadbad8380---19686854790.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/bcd752fmv7v1g5i3fq2o9b4j67/memorudavakoxawenenejul.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/hjlcehretie623si0e9aqr9lp6/tanurapixoxusopemuje.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/mafotubuxatesu.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/0cf6a4c1968b2e101f8650224d9c656f/vafikifojubuzozugijiraton.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/58215484794.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/pebosajipujipele.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/305l3du44fj8v8ppd6b5jvg5o0/nifolasoderovo.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/puwijozovumol.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/75fsq26kd35u7ce9hmufgjqtd7/zamesuzanodabufumax.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb7aa8c0be---92407354247.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/finesavemarinep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=what+are+some+examples+of+elastic+and+inelastic+goodsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14388 11164 bytes
SHA-256: 86ba84977738ea6be90b72db82b6be6b83fd2dc9060f07dbf8119592cc7201ce
font_01_sfnt_off00015d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D46 18816 bytes
SHA-256: 592e0748f9abb3a3b811d1c23e9dd29f97f0836177f43af0b580c0b38f38d0b7
font_02_sfnt_off00018f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F8D 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68
font_03_sfnt_off0001a529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A529 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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