Malicious PDF — malware analysis report

Static analysis result for SHA-256 42573b5a5194fa9a…

MALICIOUS

PDF

94.1 KB Created: 2021-08-02 04:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 473acdb2a4d8ac7065a488a110f7489c SHA-1: 79147ce39addf8cce6e4c1a20ee0970da0d6015d SHA-256: 42573b5a5194fa9a33fdb373bf2046611cfa7ef58467a23fbd4da6f935f3231a
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm or redirection mechanism. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or trojan delivery intent.

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://holocaustresearch.pl/nowy/photo/file/dinaxujuj.pdf In PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/v402vti51ld9iha2f4eucb84lc/wijewubaxatomebuv.pdfIn PDF document text
    • https://austarpharma.com/upload/files/zogunedaferep.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608528d856267---luzewapi.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/23478334927.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/89148479932.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/e6f28a919a3f75338895545f116f5eed/51726820985.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dba95b5d940---45176244573.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/58784519842.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/kowasunuxegupe.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/wugenabawer.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105172111513614.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917c1881bbd---830021068.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/janewux.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160953c2ca0fa2---45748570472.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075b1462b030---12187760411.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/zetubi.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85adb92254---wegaxadiju.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/26965796032.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/80749170807.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/301146d14231b72ed08e7342bb60c02f/kopugab.pdfIn PDF document text
    • https://kopari.hu/files/file/49518438350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+do+mental+calculationPDF 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_off00010f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12731 10440 bytes
SHA-256: 6e49fb3b9b86439b490cea0b7ef59b4013f86e78dd59c1bc74122921cc49c463
font_02_sfnt_off00013eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECA 16920 bytes
SHA-256: 56a18eee9faea679c5dc0e6bf2846e5ed46d3ab7ef4f7624b5f51a8e7efe7336

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