Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f28c090d2b9d8d…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 08:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8d3795a089074d24832f723b5d611a02 SHA-1: 9685f3e173a2691a6f0efb7909c7c84a7b248606 SHA-256: 55f28c090d2b9d8db0c24af72ea1cabda94bbe2aabd6bf57b928b7259e0e1451
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and link farms pointing to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://archism.ru/uplcv?utm_term=best+manga+reader+app+2021 PDF link annotation
    • http://185.33.116.145/~acus01/upload/files/xetorofirepajakexo.pdfPDF link annotation
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/2144888413612f7eb820e92.pdfIn PDF document text
    • http://protok.pro/upload/files/34249656636.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bad234d8ae---xasitipitifasoponirekimu.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/molozowe.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/65482726351.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/61176742654.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161326410a9cc1---rinemekosevusezafuvol.pdfIn PDF document text
    • http://teakdeck.pl/files/file/lexeremesutufepumeras.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/jexatobedoxejikuj.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/9600634541.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/94398496260.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/10014999380.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/71772482095.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/96758352121.pdfIn PDF document text
    • https://combrooncom.com/contents/files/bogesujoxinomunun.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebbc77cdaf---wasemarexular.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/46610775789.pdfIn PDF document text
    • http://fteq.ru/files/file/67265123590.pdfIn PDF document text
    • http://millecolori.it/images/file/wikovupewolofukemexabe.pdfIn PDF document text
    • http://sparkpro.lv/content/file/4354888986.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/1269955195.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613daa338453f---zinoridafebajo.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/35550746414.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/pawawomujazaxavaledibu.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/maponosolotomok.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_off0000d94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94B 10824 bytes
SHA-256: 800f10db535da341bd8c7a738675e67779bc0c1786d9a5bf321f84e075fa2fa2
font_01_sfnt_off0000f222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 18096 bytes
SHA-256: f2184e23a1a11bb7872abeb1cbac486178c627a699630fd65aa557b336de4f11
font_02_sfnt_off00012168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12168 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1