Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b85193e0caac413…

MALICIOUS

PDF

81.7 KB Created: 2021-09-15 19:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 83a7999a53ed6d2b3799dc23625cb7e4 SHA-1: 9d750a9f371372428c2ed04baed97c8f49d89d2a SHA-256: 0b85193e0caac4135d6a985d0128b76bd0aa4c41b57f6018980d598754431a2f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting. These links likely serve as redirects to phishing sites or malware downloaders, aligning with the 'Spearphishing Attachment' and 'Exploitation for Client Execution' MITRE ATT&CK techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://webinaris.biz/ckfinder/userfiles/publics/files/92744827909.pdf In PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/modaxoxidivumafimelipin.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613e94238426b---mewuporukalab.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/37699301516.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/13072346246.pdfIn PDF document text
    • http://xenangheli.vn/public/files/namajunemiloti.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613eeef5cf465---fivonara.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/jozeb.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/51978010774.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/surapokotovajotibuluzix.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccf637c0de---3177238949.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/fekexaxugapopekipivojorav.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/12686240827.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/76038598799.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/lunufajedavixit.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/1587c44e4e0948bb02f282b35130eae8/tozalurudakavab.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/9941834476.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/52044785319.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/a1570a5007c35881ba15d9b1ca771886/62702213558.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/4e64f02230ba47677144e15fc21e7fe7/sogumukamu.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/xopinekonon.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/vomozixefunuwudapi.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/82307017283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=k+means+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_off0000db9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9D 10020 bytes
SHA-256: 3d98a2e71b2781cb7c8c02db994b74016a1b424a3ffb5d7208cfe9f8924705a2
font_01_sfnt_off0000f1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C6 18604 bytes
SHA-256: 9678cd1fecb14b460ef2ef43ba11483a779889e10c035165f5d23c33bf30bd8f
font_02_sfnt_off0001219e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1