Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98d1cd82ea54803…

MALICIOUS

PDF

82.3 KB Created: 2021-09-04 11:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6994020289d59af5aaa3ea342fa9f3f4 SHA-1: e37b45d43d8eda7950cedffd713782d1dce45b47 SHA-256: d98d1cd82ea54803e021ec50f96708863bf35df56257bcbb13c151fe137f7d29
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external URIs, many pointing to compromised CMS uploads or disposable hosting, suggests it is designed to redirect users to malicious sites. The specific heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to use link farms for SEO poisoning or to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=singapore+airlines+flight+schedule+pdf PDF link annotation
    • http://anhuifan.com/upload_fck/file/2021-5-4/20210504044605116697.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/76202034701.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210718100510_o9k6sb.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/0736a4c00205389c1c9a629fb5415b26/30107365048.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/febojaniseral.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/83827118752.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0bb8bf99a---zizipivewo.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60cfb79901---jexelevebo.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/55506701214.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/71801126644.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c14c1c0ce---bidufapurakip.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082436040d64---38978266337.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8245b22ce2---rokorizewarol.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/napawikezimurira.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ccd99bff84---18395380586.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/91516394516.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/ab50c367f6c084a71fd82f9093dead2c/bekufuna.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/mirudaxopodogakodagudinat.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/61705234532.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f65fa75ffb1---wesixizuvolagemiwelezifi.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/012359152201.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/lizejoximuzazip.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/95949237460.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/zinuli.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/1c2466e7a7ccefe5a0570cc6e4a9bca6/woparujabujakugopamafuj.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_off0000d9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CA 18320 bytes
SHA-256: afe240518dbd47697f33423db44a79ef762cbc91428612889498ecab8c9172e5
font_01_sfnt_off00010973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10973 11072 bytes
SHA-256: fa4dc4b736b83f769dac2e37f881b5001a6ddb58fbd4f4a3e803c1a4d8065868
font_02_sfnt_off000122fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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