Malicious PDF — malware analysis report

Static analysis result for SHA-256 241cb1261d4d978f…

MALICIOUS

PDF

87.1 KB Created: 2021-07-22 06:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cd64e5f717abc80adc91d0b634600d76 SHA-1: 360de801cd880ffbe4dea4553b1b454b945690ae SHA-256: 241cb1261d4d978f2defbcc3f6e2c682c79a9439ed5029678d0d9ef2102a3a8d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers strongly indicate malicious intent, and the structure aligns with techniques used to host and distribute malware or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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/160e6079c5c342---44175098369.pdf In PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16088036e6ef14---lapekivokok.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef2399e233---23622798938.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/78001505463.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/g9k8kfdadt71eh27sj07ioped0/butazusaso.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/mutegurusazuw.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/nudalovadibivivofokun.pdfIn PDF document text
    • http://protok.pro/upload/files/fugilujowogamolalapiwi.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/7600487b4ee87126aa06144aef24df05/60390081745.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb266d348d---47368411767.pdfIn PDF document text
    • http://tulsamemorialclass1969.com/clients/8/8b/8b8b36ecbaf17f244e47af75a29dfbe2/File/sigukapovira.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/kurojinetufuzalojutin.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/kajevefenaz.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/jenet.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/gipop.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/zalivefugadozikopujo.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6316f9e9---36984367972.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/legaxemutanixunor.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/6506240883.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/500dd0e536bcc5510af19044f49f6019/wupogefofuwebezirazorikog.pdfIn PDF document text
    • http://alvirne88.com/clients/71477/File/32613368214.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c2632ea2364---detaduvunadaz.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d300bfdf9---kalexonu.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/57209621549.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/41816504700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=infiltration+in+sciencePDF 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_off0000f11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11D 10280 bytes
SHA-256: fd90805369163d3b5f3a8c9d8deab6399ece5210edf543e80f2a7d80d70153f8
font_01_sfnt_off00010860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10860 18540 bytes
SHA-256: 982197a96d1ef9c7bc7d3cf8e07467c31b053f96735605531f61d5896951ae33
font_02_sfnt_off00013748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1