Malicious PDF — malware analysis report

Static analysis result for SHA-256 b169c31cfc6d9f23…

MALICIOUS

PDF

111.0 KB Created: 2021-07-30 06:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c7ab6e381436afa681d40c7ef2b769ca SHA-1: 1d765734e1b42064af0e727c566b616c2e5f5125 SHA-256: b169c31cfc6d9f23b0357d1e919e83dfd9de225873859cfc9959deacdd6bb35e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/1b5a0a4b3146c8d8782e38be9689981e/15409313753.pdf In PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/cac6949b0d619fe375ab2da3444b699f/16050120071.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/00a3f988884b8ae73266df239f0155b9/surajepipokijem.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/7052846076.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/vudogawifuvirexuwupukuw.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/fc46835e571a28b1487a905cdc668b2f/zululuvo.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909d0ce9091---21387087431.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/89263524023.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/59543268418.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/97434976180.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/76605194232.pdfIn PDF document text
    • https://argumentua.com/i/file/61495640449.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba3b9bc4cd---tuvijijufobebezedisogom.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075767e8d40e---kikuzupagaxipelebunoxaz.pdfIn PDF document text
    • https://lukili.ch/UserFiles/files/robewatela.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/vonuminikewikodosab.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b95676fc---diberofobobox.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e55fa87995---41202503702.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/rukexatubadofelovukesil.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/sakamuf.pdfIn PDF document text
    • http://aweibel.com/Photo/file/rorefinarivuwiriwemorixi.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087d983621be---17993231877.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/dhch4ma8ouf2510do6vqbtuobs/wavorudikumasatijonabet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=dimensional+analysis+worksheet+2+answer+keyPDF link annotation
    • 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_off00014b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B32 18748 bytes
SHA-256: efbe9b3e258bc425c7025bde1111c26462ee7542d78e3b2306ee8604ba36f7a0
font_01_sfnt_off00017ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CA8 10788 bytes
SHA-256: bc67db84355cf6124e28971c28d5379d9da22ba2b9d8b1f7421b5525b1a0e77f
font_02_sfnt_off00019570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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