Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a0a8c9198b5f34e…

MALICIOUS

PDF

71.0 KB Created: 2021-09-16 08:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5b045a7d310b5245210630afae6ef0d0 SHA-1: dac4e7f5a71c14ed55889d2bc2607b45573fbd78 SHA-256: 7a0a8c9198b5f34ea853f653289c9fc4f4b5e4220751059cde7ed71ed9928cee
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://synerhu.ru/uplcv?utm_term=types+of+graphs+and+their+uses PDF link annotation
    • http://sportingfoundation.com/uploads/file/29981119799.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/27346360129.pdfIn PDF document text
    • https://pecintajp.com/contents/files/gewobax.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/namolorabewazusune.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/wenevazesidijiki.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/diranufun.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/vdrf1s3nttt38lfhqq7ft7ivlr/verenojufazobaluborilefi.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613aecd34ffc3---72293763059.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/44865918389.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/5285117701.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/4362620665.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/75806715521.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/fasudomegugumukafageg.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/34894616894.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/nigujaperoxuvudugijidofo.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b2ae2a315---3344884256.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210911_0F6C84500F7B294C.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613feae1762ec---xugedefuwaxi.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/pirexezikavexanadosar.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/98763475993.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/poluw.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/nidojidibe.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142cb95efc62---kejokurijikuranigesewavid.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_off0000b61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB61F 15360 bytes
SHA-256: 0efa8669b61fb5e5e0a1a1a3918faa1dbbe4db89bf0a9ac81250f8bf5d82c833
font_01_sfnt_off0000dd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD00 10908 bytes
SHA-256: 4be6e48fde35d94b9f49a3039e4669941cdfc2650f01e73ee6a4622a1e36371e
font_02_sfnt_off0000f610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF610 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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