Malicious PDF — malware analysis report

Static analysis result for SHA-256 22e576e57913989b…

MALICIOUS

PDF

83.9 KB Created: 2021-07-24 07:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 935b20dbc13b08ab76c62073132a06fc SHA-1: 8d37d8c20629e7c9a5c293c391bf9045909fc7a8 SHA-256: 22e576e57913989bd6ced67647eec52f50943cc94d7eb3b5be352a2cdb882155
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites, likely to serve a malicious payload. The presence of a 'download button' lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9fbb1b6103---xibovejisejulurosafov.pdf In PDF document text
    • https://hankilfood.com/upfile/files/38288603702.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/45276721921.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/3f028622f1442adbe2b2b98376b9009e/94882738723.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/10944267099.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/81652632790.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/dakekutemavofesisigago.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/47287393630.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/fii6bnscg7ntnsoacg12g0n23q/fokumigowoxope.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ikqi3hc549qj2d38166p0auh93/34203784566.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/heqeaueluoofbshpot9blgc3il/32272466167.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/furuxaxafafu.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6864c243d4---gupalon.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072ca3f7cecf---kikojena.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/81636618240.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/2g7p7k1djrau49os60hka7g3qt/luxeko.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/93034076367.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924407cb829---84323037153.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/34228bc4321c66d3f62e45122e810003/dotumerake.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/36311138275.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/nonizonuzobonugugo.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/senuwokovonavusineri.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a722e4e8c3b---nupupidosuxelafizi.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/zoxolozeranufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=mcdougal+littell+geometry+chapter+4+test+b+answersPDF 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_off0000e046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE046 11472 bytes
SHA-256: 7ecf7eb86927927007cbb550605c5be70fd8c7d533b59b02ce84c744fa3c7664
font_01_sfnt_off0000fae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE9 17636 bytes
SHA-256: 96a1e067f36d9982c14c6720505b3b0a8654573a69fbb675f1dcbd66cdaafa82
font_02_sfnt_off00012944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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