Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fad7dd56f48ecdd…

MALICIOUS

PDF

82.1 KB Created: 2021-08-31 06:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dc1e3c24a5da25c648b452fd60326c39 SHA-1: a9c4ddfad1d8c94594f790dc99951d92ffcff486 SHA-256: 1fad7dd56f48ecdda62f92d296543cb7ff4b7bc58b511bf24589c2171435791b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cructi.ru/uplcv?utm_term=thirsty+crow+drawing PDF link annotation
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/48489ea54326088c757ee4fb7a7c7f5f/jagekaluxudijekexur.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/37281602952.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/nutovawivurebixafep.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3fb854dde---13964951812.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/nowupomir.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607942d3490a7---zanafulos.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/jqifuoulv6h5ln9u24ep3algbf/97244342836.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/pewadukegufud.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/66057723496.pdfIn PDF document text
    • http://www.celso.org/download/75977113178.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/6682845bf695018f839a7a58aa297970/dexijufezujixebabi.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/zizexekafax.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/dufofufabababurixitav.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/saluzetisebetidipife.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e519b4a4e---bemaviwimave.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/33234663291.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161257435db903---90850797373.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/xelazibularizebixugutati.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/liponalatejatawafa.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/dakebaxubakadarusetole.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/xelemaviked.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/jojagupizelijagoriw.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/kukeginalatanuja.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4320cadfc---69577848041.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/movugiro.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/sl911s63bloggp7rn5f4cpklnr/kabakowetezewonomaz.pdfIn PDF document text
    • http://www.desipainters.com/wp-In 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_off0000df51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF51 16588 bytes
SHA-256: e241172319d46f9c3a8a57a1986977544ce5a004df46f92cdddaaefe0c1c91dc
font_01_sfnt_off00010a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12273 10636 bytes
SHA-256: 55e5fbf3a4bb4cb641afb4a456e8a42ab755585a547ebe10bc2f533361291c29

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