Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc9b1818f2b738b…

MALICIOUS

PDF

84.3 KB Created: 2021-10-06 23:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e5d0b40325071987531014f364474397 SHA-1: 767087dbe59abb8ab4e5783644cfdd7cdf0b37d2 SHA-256: 9dc9b1818f2b738be56bad067c1ba5cafb05b56bc364e9e2286ddd629bc03d98
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous external URLs pointing to potentially compromised websites or disposable domains, suggesting an attempt to lure users to malicious content. The PDF structure and embedded URIs strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=1st+puc+business+studies+notes+in+english PDF link annotation
    • http://doradcyprawni.com/images/pliki/kirawovugakamuwolom.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/6361ff452009b9ab141e0a2c5d58d06f/73391780188.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/xupije.pdfIn PDF document text
    • https://myoffice.acqualive.com/uploads/files/wavogo.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/rubaxobixevulujebokogov.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/cc11b6bb379dce0726d7f7552810ab00/wasituguvasemepupen.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/rapalepajozigofesojajam.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614ff2310051c---ropezasuzotudan.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/dce4ce6a003eebd3937d8694d65eaae5/31207625429.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/noparurozud.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efcf09aeba---48755120381.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/69700963821.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/93765992723.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142c0d075c77---sozotovusatanofosedulu.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/kidaxofibarixemuvesuj.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/93642609058.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/87509557219.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/92890786213.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/77826428110.pdfIn PDF document text
    • https://demideopool.ro/ckfinder/userfiles/files/bagevesosukovubakogilejot.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/56697581480.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/803376260.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133812b0118b---19861748521.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_off0000df65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF777 19820 bytes
SHA-256: f2077320f371bed02e8b4acd3f1b2b891ff60300b55ce7dfeba7b61f118a8f15
font_02_sfnt_off00012b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5A 10724 bytes
SHA-256: 217668b5a121830a466620a21e5565bbbefa41991741c7b81fa3b2bb373df8b4

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