Malicious PDF — malware analysis report

Static analysis result for SHA-256 f08a3d1e4e855cdf…

MALICIOUS

PDF

89.8 KB Created: 2021-06-25 05:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 88ae319fda0b54c9f64c9f6007270c31 SHA-1: e1229711405f70a83de99b8164776bfb76b11ce4 SHA-256: f08a3d1e4e855cdfbbebd701a926ed0894cc150120e76c23580a364838b42cec
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://smidgel.ru/uplcv?utm_term=suchitra+bhattacharya+pdf PDF link annotation
    • https://bravo-hk.com/userfiles/file/sibigapapi.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef7a92fbde---zakijola.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/6d972834e2ac40ea378bc7ebbcec3d3f/naresu.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cf2d9c7bc---tamakiwu.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/9e29571db89611d72fdba34aea92c3a4/30129553635.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/nojub.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/535b83315e41e45df749a90652aacd0f/22171643874.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/0354dba445331a3c00703a49c97a6027/58059650249.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a130bce30---20262744477.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/5a02f2d4e17593486e8cbd0d4d513f40/74044455129.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/98810341778.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ml035bahgspu3p6lk1fauuv4n0/rizefesubivuwaxonejudu.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d24b34cb2a---27736908624.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/7eace84af67f91cd9aea1836c332d3f2/8382648866.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838098805b2---54383793035.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/62266050478.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/vilixilexoxenojiwawofe.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/nemazotuwari.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999ff079837---vivuzupekeligipimu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 5376 bytes
SHA-256: bb10815553a9ff0582b0dd38a7a34baf4bcb8b1459bd1dd1a80a4abcd57e210d
font_01_sfnt_off000106df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DF 15172 bytes
SHA-256: 26abcbd59a1d9d6c32fb46471f8f2bb7f4e4ae45cf7f6dd516474646c3f79dc3
font_02_sfnt_off00013468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13468 10928 bytes
SHA-256: 54c253542d371d1bf06e644e2348298f038cb4188df35640ccc5952d0cbe5c8a

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