Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7786817cdb7ef1…

MALICIOUS

PDF

97.5 KB Created: 2021-07-03 20:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 87364f5c076361cbe21138cfa3d34bee SHA-1: 9899c1804ee15ace004a9e4d1787e4e8577a8e61 SHA-256: ae7786817cdb7ef143a06d46fdc47d13e998aa7bc8e41a339b02c0743d75a69b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://coretry.ru/uplcv?utm_term=cherry+tree+question+answer+11th+class PDF link annotation
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/hrph5d5drrnh6i2plvk6bmaqr7/47214438777.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d453ee1009---lewexezateduzesugekugipiw.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/36553182010.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/cveskj45bec8iu318uon8svae3/xijobekekewuramob.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a63422a51---17652862026.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf28fe8a8b---zifos.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/8063475016.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021060817531582.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/eae5945da14e397517b111bd4a83d934.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/baec65ec44184a6314bf175d60c2d4af/bavurunejafefi.pdfIn PDF document text
    • http://tafoto.de/img/upload/files/zirebef.pdfIn PDF document text
    • https://rm-parketi.si/uploads/67060048301.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210615191047.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/19a0a9p2m0o92j36jhmhsjllao/17222619816.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/5rhv667rmelhmed2ukktb36tnv/xegubekixaw.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/8e0589d3cc2892498e45ef1d614e07cc/2689492248.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/7vhvdbedfq5hc34cjkname3is4/62733274545.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa429119cad---81818959580.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/e1b305f490508fb33fcd6b8e92343216/bumib.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/0630fed6549dd4ef396b28cd5bb11d00/vulagute.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b220341146---tedoluguwux.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/68264270182.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/vnk59k674unlujt67b102rrtv4/34867241490.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b28d7dd450---lolugemava.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_off0001140c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140C 19896 bytes
SHA-256: 98563375d4e6ac5ee9f5fa4d913d05865f338851b8ab507a88d3dca56ebb41d1
font_01_sfnt_off000147d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FEA 10856 bytes
SHA-256: e8bc275cf9376576e55c287401445e5b8c019f6144c0bc45e99fe2bc94a88868

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