Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dcb56c66c72d498…

MALICIOUS

PDF

78.9 KB Created: 2021-05-30 21:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e822b20c1ecb3a282868cfad0a1f08dc SHA-1: b0f0fa90d8ed0e88002c21db8f1df3355a2c41fa SHA-256: 7dcb56c66c72d4983599fe91e0d75b92573120f17ec28ea7610f634cb5a3e1b2
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious files. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's designed to distribute further malware. No scripts were extracted, but the presence of numerous URLs on compromised CMS uploads points to a distribution mechanism.

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://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160856620b6ad7---wexijutulapod.pdf In PDF document text
    • http://sooclose.eu/upload/File/xezolugariv.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8920535f7---lanobusixanufezebozuxabi.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0abfeb665c---gunojo.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bc86b3b30---56519890047.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/nl69s2uf7flhrme2bn1n3alf1u/58327327368.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/97297251179.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/jk1kf309rhvhiinpsj301d8sf1/25436574335.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/9600652487.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/90b0c9b2bccf14b62b6d99544ed354dc/93477266877.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/76044613454.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/96727510683.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/mosewig.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/wixobutowutetiz.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/skd3qbtum54mubblrkfhol7bk4/bopotujijotavuw.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e6c37b255---29707539189.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/13dd01a2a91bec6e986d24e5faae39dd/jopufepikamixevubegezaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=dc+legends+of+tomorrow+episodes+season+2PDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D3 5700 bytes
SHA-256: 7244f3f6575e0b647a21e64d1b4baf14a06bcf25547e15f56158527ba7f5cf5a
font_01_sfnt_off00010a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A37 10696 bytes
SHA-256: 176f534224eabe1be50de8d967309b94dc471db4687d18f9ea5adb6fbec2352f