Malicious PDF — malware analysis report

Static analysis result for SHA-256 08722cbd9fcfea40…

MALICIOUS

PDF

96.5 KB Created: 2021-07-06 08:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d1ea4f6d4b61a2883c9f7468e7effb9e SHA-1: a6e9d8602ab18d968e4312317f091b74ea377417 SHA-256: 08722cbd9fcfea401fc0bf2155a0d1fc264cc3118066ae9fb8f3656baf005d9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users through multiple compromised WordPress sites to a final malicious URL. The presence of numerous external URIs and link farm heuristics strongly suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://wastran.ru/uplcv?utm_term=let%27s+go+eevee+how+to+get+to+lavender+town PDF link annotation
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcf33d589f---94281375287.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/2uolqjm60ba3k79iaocq3720an/mufupu.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2567373475---67318465516.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/50523478492.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/51dee0b2e142b5e7a0fa850c54aba005/7601490860.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/50bd1ac4ea61951246ec01ed46a8b36f/lifopunolomasuwetina.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/4e60c872dd65a638b7f37923d545f736/50709885088.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f14a2c3e2f---99797526977.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/sosodekanepukevonekuzutak.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16072f26d64c7b---lesezamukato.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcb79a72d3---92203587914.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/aa3f7db13bf97fe7ffdf088bf49d9596/wejus.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/5b1bb43454c89e50286a1649728aefdd/29799380400.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/uva662gkvb1op9mr8qdl7i8le7/41264208839.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae97728069---38982697048.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/23702992253.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/53418899500.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/b4679722a2cf4977e5a839d67bae359d/93067708315.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607456c28a6a8---futitexokirokeledufut.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/kepisuwodixesitubig.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/95663186690.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/90597089934.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/puseburube.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076415307281---74804691187.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/gibawibo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB7 18132 bytes
SHA-256: 827956b45e3f035fc73eeac1fe030daa7a15c39f62bd1682de3afbee76a0ba61
font_01_sfnt_off000116a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A4 17204 bytes
SHA-256: d404e5df1d80cd6f7bd96b0ecdb7993e1f8d7126cc20d07de089fdb7ccad596a
font_02_sfnt_off00014398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BAF 10576 bytes
SHA-256: 3d7ce1f620183a2689337a25120b3e79ae01cdfeff783eb284229f6839bfba5d

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