Malicious PDF — malware analysis report

Static analysis result for SHA-256 590f92abeae2205a…

MALICIOUS

PDF

90.8 KB Created: 2021-08-10 18:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: bfb389630ab88fe974ae8dfc6c23d697 SHA-1: e110dabc5e251fa6bd886f7e5dd97df83fa0b5e9 SHA-256: 590f92abeae2205a6fcc92a1446bc0971219843e1cf9ed83b37a919e934d2d8f
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://crewmak.ru/uplcv?utm_term=licence+key+for+restoro+free PDF link annotation
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2c69d942f4a0e3702a12224cced228e1/jafod.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/2ve7qtv8he7l9fpag51r8c40l4/wukinaliwogalovufo.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/5gg7ccg1uv1oq6j602fhfbdvlb/lejinuraj.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/73382950675.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abbdb5d224---mopenefodidate.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210620_9659550485964FC6.pdfIn PDF document text
    • http://dalaichau.com/files/5128937897.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/73461043908.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/6efa4922309ba56ab51d81c9b0770e24/36519572196.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/53689372742.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/busikejuwewe.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/zijiti.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/b9mtne8item7cg5kliqt481sl6/jugagukavupekaxezemivi.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/e6239e9a989df6ba3f54f6058789ef1e/zinobesoxal.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/93800993530.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/42556597696.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/424d00e514cbe3879c469732e5ae0066/97021218179.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/17773123776.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/1a0218769bc4784c09882736f796c315/53028937035.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/91479377698.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/xapefiraw.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/sezazubavepeb.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/78211762476.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/detifuje.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_off00010122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11934 16800 bytes
SHA-256: 3b3c1a65192e708dba3f9ddc08ae173cdadaf8a84adba3b3a10fbb378265274e
font_02_sfnt_off000144e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E7 10284 bytes
SHA-256: 732d7c3fe5797a8c3e97f29d983bd94ecc541cc9e4d125672c449123a8474d89

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