Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95db66748e5d103…

MALICIOUS

PDF

94.3 KB Created: 2021-09-02 06:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e5421650a6626139a039e6877c482cd7 SHA-1: 2b0c461a50f9803bd4abbbc15bce57b1d98eba7d SHA-256: f95db66748e5d1031e820d8fc858e3d85dc2f17c81f3dcc86d913bb739ca1f1a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://emauto.lv/index/images/up/file/47819868975.pdf In PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607275ec1633b---jakanibuguwakuke.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/65780598285.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/c7efc8c186477dc362d559d1d9c5afbd/10645643723.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/52757445093.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/3fb037418548072839afa7a21217963a/vakemali.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/29128459878.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/dijulilelabukej.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612bf50c94364---88349817764.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16088829dc8634---wokovubeb.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/zutubo.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/piwitotipagirogapig.pdfIn PDF document text
    • http://keramann.ru/uploads/files/5914815671.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90e0b6e314---92839386550.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/rotejofiwozuwekaval.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/diweginorezadamasosejagaf.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b773a627494---64854822059.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/fumanajusuwulogisogo.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/fawirebosuw.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70b5ddd419---gopukujadotewuvebexedodo.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/5fec21fa7304a41d729a418d9aba6c1c/14913531262.pdfIn PDF document text
    • https://siroyensao.com/upload/files/2707523060.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/zatoxusak.pdfIn PDF document text
    • https://auto826.com/uploads/files/59339711931.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/i4092ob75ielt6orr08drju9lt/jepaxis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=excel+chart+data+tablePDF 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_off00010c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C00 10208 bytes
SHA-256: 93a1f33bb1377cc69f3a54f985ed4397fff277ea008de88059a1effe6ce7d064
font_01_sfnt_off00012308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12308 18508 bytes
SHA-256: 56e0c024b3d9aa4c6673806c5e00aeb2c8f26decf99431ad22dfc4f6d288311e
font_02_sfnt_off00015307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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