Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbfa7e5afc3cae3…

MALICIOUS

PDF

114.5 KB Created: 2021-06-27 04:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d6d1bfaf2c231d52b40db5bdde6dfdfa SHA-1: adeeade578758d6335a6b6ed6e3178b24736b5c8 SHA-256: 9dbfa7e5afc3cae36e7ead8331f9a576c40658edec39f46d2c432268c23f1a94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a malicious document, possibly delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9836

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://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609465b43e522---xuramudawef.pdf In PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffb3eec44f---mijanivigodelikozakob.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/26168322287.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/33311548478.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/29d1927435dc3c4b3960919d5697154a/46496907395.pdfIn PDF document text
    • http://wsm.hk/images/files/4600252956.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021062520552253.pdfIn PDF document text
    • https://people11people.gr/uploads/File/31262608732.pdfIn PDF document text
    • http://markone-tools.com/upload/files/47574692976.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/4dt4aurfmoa7c1rem7o39n4ebk/83729343139.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/ff8b24473fc24a9eed359d3acfa9f3f4/74809122019.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607453175184c---13881067406.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075b3b7475b6---19046573778.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ef2gmu0bo188f04e0kais724l2/varax.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/14132755402.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/88cc54d8538f1fdd1d2838db3c71f8a3/pilesenananufodifotimifu.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960bd90a07e---buxajetawutus.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160acbda51b66d---mubagikuxotikupefademuze.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/nagedizalekuvigo.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/9069ca26a54f836535af30a0ab0625a5/41786689573.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/0bd8bb0658129891a006d296fae69845/5377817561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=lee+min+ho+movies+onlinePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001316c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316C 10036 bytes
SHA-256: 10620a0997dfc2cf0f7aa5ce3ff48c1402315275e3e275157e4c53ec94616332
font_01_sfnt_off0001476d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1476D 5312 bytes
SHA-256: 6ec82ddba1483bb5bc8376315a5d5c596794afc0570356fb4a701fbbc0854501
font_02_sfnt_off00015a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A60 19092 bytes
SHA-256: 205d75506edf4a9b6e62741af090995d20020cc0f8421216bd7b81c6b91d5511
font_03_sfnt_off00018ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001a4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4B6 16224 bytes
SHA-256: da79484a7f94e028a8871d907a282bdc2df095dfef79f7b1f2af1efeeab75da7

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