Malicious PDF — malware analysis report

Static analysis result for SHA-256 05132f352ccd6d54…

MALICIOUS

PDF

88.1 KB Created: 2021-09-05 19:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eeaae79b59d89daf5cd3e47ffc78def4 SHA-1: a461360b1daac091f472cd3a0f2517363e3f07bd SHA-256: 05132f352ccd6d549490a0cf8db9fdbb6d76e2c530d740562c39b8afe976fe92
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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 https://smidgel.ru/uplcv?utm_term=trigonometry+questions+for+rrb+ntpc+pdf PDF link annotation
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f9323dc8884---50905467859.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160788656eaf07---zulure.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///rezetebu.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea226ad2d6---tawogaxukofilozafas.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/93341071920.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/3553525181.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/jlps1tcu0h0c9844m1oq1pivs9/jiwipaxuzunolexavonew.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/jexalonivanojemotipu.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160741b09795ff---napewifanovofavo.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/28870526054.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/22693926405.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/vefog.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/91935673443.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/31898644121.pdfIn PDF document text
    • https://rcot.org/userfiles/file/69930766663.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/jdgt57lamhg4i7d8e8bl5p1ck3/26218655610.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/38954469881.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/gip4fv6jetok040q01d6p1qav4/lugidofupobasuzibasok.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/43e8e6rdso57tdt7ivdb465915/23427746154.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/62212528740.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/d4bd7dd841d3a51e92f179091100a1cc/34036473813.pdfIn PDF document text
    • http://hciclerp.com/asset/uploads/files/39089106487.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/08/11/file/20210811_164933_131.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/wezijodokezaletojur.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_off0000ef78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF78 11220 bytes
SHA-256: 5a3794b2470cec2faa9e54c9cbe79e0256806451b2f8979b56f67c120fd33032
font_01_sfnt_off00010900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10900 18708 bytes
SHA-256: a9ce136450e0afe5cd006306b7d9064d1090ec708f819c0d79811d85f35512a5
font_02_sfnt_off00013a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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