Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec52ac96e987166…

MALICIOUS

PDF

95.7 KB Created: 2021-07-28 13:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a1470c1e1f6e4ac53de9e36892a10682 SHA-1: 000bbe0795fcc0797f340d516a632711af5087a7 SHA-256: 6ec52ac96e9871661f9b04b2d0763e087bb49d2bbfe743358792cced2f094a2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to compromised WordPress upload storage. The document body is heavily obfuscated, but the presence of numerous URLs suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079763b46f89---notamidujavufi.pdf In PDF document text
    • http://se-ty.ru/uploads/userfiles/file/39717717340.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/e8064b38ad0a77caaeaa32302a13a3c0/27552501650.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/43599104408.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/fajereborulabupuvisibo.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/84447590377c3c4c41ee728ea8aeed71/narebevoxodijelalerirazer.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077e369ac465---bijuwapamowewavoda.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/35fa98bf1517fded6bb2483d3b3de070/dadusarapoxeritipuf.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/81734297540.pdfIn PDF document text
    • http://wsm.hk/images/files/63571176351.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/36285338244.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/d3c06caedd7fe52a685a28451583fe50/monurilorepevagubag.pdfIn PDF document text
    • http://www.fk-fudosan.net/app/webroot/img/userfiles/files/nimedofidunizukekoxamir.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/wusojaruxemumexi.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/77d58cb4b92ab9d5669bea03768ba8bf/81410548653.pdfIn PDF document text
    • http://sanmarinreunion.com/clients/c/c0/c0747301521b2fcd71a0106c9132c7e7/File/92484107967.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/d1516eaec559d942965a0b8b4834c700/xedomawaz.pdfIn PDF document text
    • http://sparkpro.lv/content/file/97854777116.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/satevuduvibojedolewekumo.pdfIn PDF document text
    • https://werbemittelag.chupload/file/vukojida.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a141d03cd---kanisojuxarivaxuxonumuk.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/45533532722.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/wurigeza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=5-part+hematology+analyzer+principlePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 17808 bytes
SHA-256: fda57d23ac6ab4278cf08924edc5b5afab1621f311896d748bfe88632312992f
font_01_sfnt_off00011eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB5 10896 bytes
SHA-256: 2864c4c1252f4edf7366906e63fccb7a3cb6e708e58f99b7584fa31c65371172
font_02_sfnt_off000137da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE7 1668 bytes
SHA-256: a8dfa31e81e4ab78067ce0ad476c2f72bf5fd96703f8402eee7ee380474c249b
font_04_sfnt_off000157d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157D7 17188 bytes
SHA-256: b7f0438ac01ee5e087ad97029a4418ce8c9b925058b1c1faf1bed66a074dcb2e

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