Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6ebc691f37011d5…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 03:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a49767596a50deca087536d65b902f23 SHA-1: 6c71294612031fcc8bb4ba7ae1afcb2878f23243 SHA-256: e6ebc691f37011d5f89bc399b55c2a968e7610766ed15b2ca9a3bcdf8b1d9e20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress uploads, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=cricket+career+2016 PDF link annotation
    • http://medi-sen.com/files/files/66059333706.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/xabogewamekevemir.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/14286423921.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/nulujasolonufarenofowas.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109021358581724.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109101357445160.pdfIn PDF document text
    • http://fohow77.ru/upload/file/56887018227.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/vifasesu.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/3612785026.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/43687527212.pdfIn PDF document text
    • http://saaretravel.ee/images/file/susebebuvofopiperuro.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/87984745774.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cac1c2fa6b---57964855089.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/vevijaf.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/67640065841.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/4c6d01a4873ea5d49980bb9747ab12a7/64589230443.pdfIn PDF document text
    • https://braus.uz/images/shared/file/wuwudapatemudenedefezewo.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/nutogapofi.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/60135554873.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/retabovin.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/78004205468.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/zazeruk.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/39671148785.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/84334075353.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fea1fe0e11---51655714135.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_off0000dc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC09 10372 bytes
SHA-256: 5a7d092ad3759ee935aa96aa97219f7dab077a547145e4e04f318d7ab278fa1b
font_01_sfnt_off0000f3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C4 17292 bytes
SHA-256: fe18ab7d636f0aa33b34d20a76f36f1e663d6e24e3e805c8a41670b843738ff5
font_02_sfnt_off000120e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1