Malicious PDF — malware analysis report

Static analysis result for SHA-256 538a385ccd8f10d9…

MALICIOUS

PDF

153.7 KB Created: 2021-07-13 16:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f7af72ce21b7ae26523631f85727d2bf SHA-1: ffcb7e0e76ec9aa356dcd8269d9ecfdb21b6b3b1 SHA-256: 538a385ccd8f10d99fd100136a23141fa60eec52764a6fd65374194a211aaadf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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://irlanc.ru/uplcv?utm_term=list+of+pokemon+by+egg+group PDF link annotation
    • http://sakuragiramenandsushi.com/uploads/files/xunepedepogimulupaxom.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b8302282e29---32346100564.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/4949811b2cd67140db232b2c652a6aff/vadijijexudavexuv.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9945e820b---82693832080.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/8938380434.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/vajuniguruwadaxepu.pdfIn PDF document text
    • http://peak-experience-japan.com/jumaxipesirojugapewupixe.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160784904e5cc7---xuwexafozitoriloriv.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a311e6640a7---rosuva.pdfIn PDF document text
    • http://ciskmv.com/css/file/3680130068.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/majisarawa.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/ginajan.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/18b5m0g41oqmcgo0erpdcejjj7/kuvonisewusuwuje.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/terobokimig.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/22399734197.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/27370419725.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/pomasa.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/52648168621.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/iav2g0oqllr3n9b2m803vtga88/kujogekirolikonavo.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/tagales.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/70114424043.pdfIn PDF document text
    • https://okazionche.com/files/funulixokataratuwijupefu.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/samavedovuwibapex.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D692 9808 bytes
SHA-256: 637b16efc2b9a51876b9d38cdce1462d4d7a644bea90cfd38e677b0b1a57afbf
font_01_sfnt_off0001f494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F494 19692 bytes
SHA-256: ec5037f9644bc66fba3b636bbf12b449a8c4b12c641b86c901764a621711f771
font_02_sfnt_off0002275a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2275A 10896 bytes
SHA-256: c4bdbaa9c41ef18f16be90bd6b0590680fb8fe35f1b909fdb66e4a12a316ac6f
font_03_sfnt_off0002406d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2406D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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