Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a925c395a2be51…

MALICIOUS

PDF

80.0 KB Created: 2021-06-06 03:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 114b5c81252447a0fccba09b38a455d0 SHA-1: 7018a500d3d7302a0386d02ad3d9320242924753 SHA-256: f7a925c395a2be519a9fa9d64a803779d900de00c69b3b4bb5184203c7c42dde
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous links pointing to compromised WordPress sites, likely part of a link farm for SEO poisoning or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of external URIs and link farms suggests an attempt to redirect users to potentially harmful destinations. No scripts were extracted, but the overall structure points to a phishing or content distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://cructi.ru/uplcv?utm_term=can+i+add+icloud+email+to+gmail+app PDF link annotation
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baba6867486---43139420381.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210523/file/78907120525.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc6f5b332b---tabarazezovoveze.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/pgc0srhvv2aoulfl4ugikhpfo7/51318500116.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/e36b3db5db1da0ccf91de51d299b362f/niwezujefebironabarabe.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609726f86242e---36702637045.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1018df64a---wugexibirebetoxozeja.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/1299ccd01e1efb3ffe3b3a57cab0600e/1966824666.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/9e2c7afd1500b03541a4810f6e4fac45/tenut.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845a2973bc8---mowafebosibubug.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/pveo9c4roopo379r2mr1e3vnk5/didejabafuvixiwurironinum.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/31331839841.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad4c598f2---zaduniserelederudimezakog.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/24598697377.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/d97a35d34208a7a96209a508789a5bab/rolut.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607082ae1aec6---4017513159.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 5024 bytes
SHA-256: 576aad69d0def5f857406b5c15af29af0bc5dbb4dd8d09f765a17bf3c3034772
font_01_sfnt_off000100c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C7 10576 bytes
SHA-256: b97c4ad12c0e0989491671600b582f6a250106ae6a354497b3980209dd3e0aca
font_02_sfnt_off000124e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E0 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f