Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b24352049d246b2…

MALICIOUS

PDF

79.3 KB Created: 2021-09-13 00:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 70431d88a8f4b6f72cc899fd3a3fd217 SHA-1: f587b8d1af598e61899f149da8d2504c17745177 SHA-256: 5b24352049d246b2f975def907108bf74d2d2bf88f544457fe1b6163f7faf942
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites and potentially disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/07e1d78c1b29c76adfc953ebb2edd5ba/35762313272.pdf In PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/38308295338.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/bonepizolodi.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/28308862674.pdfIn PDF document text
    • https://samudra99.com/contents/files/zugafisatiwe.pdfIn PDF document text
    • https://denimder.org/resimler/files/31255986043.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/puferefagoduk.pdfIn PDF document text
    • http://air-con.ru/upload/files/96071045510.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161379b518518b---pedupakutemedabonavop.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/65664142867.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/sefot.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/52523269531.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/rotugakibovasalomit.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210905165925.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/52894296286.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/92823786794.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/kipalatinunubebukuf.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/23520542068.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ac0e00071787872a3fffa70cdec7bf02/jezenef.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/749a577bb67a27edc79ae1f3963786aa/18730908941.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/94574897064.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/97240776406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=android+studio+debug+manifestPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/912225acd33c9feeb4fa80c11e258403/98901379518.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_off0000d195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD195 17368 bytes
SHA-256: fb724b45cb178146f7549cde8466d748658f6fe49ba555a21970795c30f28ffb
font_01_sfnt_off0000feb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB6 10872 bytes
SHA-256: 1f119ee4e92bf82dbd51e83ad5c884130608d89a82e761646ec110288148e9ee
font_02_sfnt_off000117ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.