Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dbc4bfd2b7c5843…

MALICIOUS

PDF

87.0 KB Created: 2021-06-26 06:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a114e4a9ddb93c3605628cde33ff05a0 SHA-1: dfa1adcb6506affb00bb5ecd662481274d6cf3be SHA-256: 0dbc4bfd2b7c584368d2da4a86a1e1a086bb620145fe2b76314ae169836054e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall detection indicate an attempt to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbba4f06df0---bapumimusezedatenabizu.pdf In PDF document text
    • http://ondrejkocar.cz/img/file/29700991142.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/54979a5526f27850a93b175171e645b9/nagoj.pdfIn PDF document text
    • https://petikdaun.com/contents//files/51152803648.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096e6b46bf1d---zemotapivepala.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/58955394540d9cc67dcfd8dd5baec93d/gaxudekesevizaxapoduwe.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/92673478734.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079b2a9ef81b---63742455377.pdfIn PDF document text
    • http://aven.su/userfiles/file/28667274000.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/dapilupibitanakaw.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/98128167986.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/fojidukuk.pdfIn PDF document text
    • http://xinyuemu.net/assets/202106/files/20210626090616482782.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078797052c78---ruvewoputopodusimesoj.pdfIn PDF document text
    • http://synowka.pl/galeria/file/moron.pdfIn PDF document text
    • https://airbays.com/userfiles/file/wuvumaxabub.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/281231166278.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/vnh7frs1a4ma094gbr1bfads8p/tixasibekupagom.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/66583143077.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/finolukimasilokadunat.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/5bc683a634d61ea13009cac256a3f572/37228424265.pdfIn PDF document text
    • http://shosholoza.de/file/sujinazokexisobumez.pdfIn PDF document text
    • https://unosms.us/userfiles/file/davadadika.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f1913c02c---nukomudiwuxivirejato.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c578f518711---92016303184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=head+shaking+while+talkingPDF 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_off0000f2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F4 10476 bytes
SHA-256: 364caf4aba05da98b6794fff0b2c4ddf96e93d4cee45fdb578791eef80c7948e
font_01_sfnt_off00010a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001228a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228A 16952 bytes
SHA-256: c5090651bea97ad9c08587f2198cf1605a5219a7cd0baf5638952a3e52fb002d