Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa3f0885b9a94e9…

MALICIOUS

PDF

69.4 KB Created: 2021-06-18 09:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ac6c21c4610618acb892afb3091ec038 SHA-1: dc27692003a937dfa51b68c00661bfe944ba60a7 SHA-256: baa3f0885b9a94e9ad1910a97e79caa63e5ece1c3a563518aac67875e75cc883
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document is flagged as malicious by ML classifiers and ClamAV, and contains heuristics indicating it's a link farm and a lure for remote support tools. The document body, though heavily obfuscated, suggests a download lure. The embedded URLs, particularly those hosted on compromised WordPress sites, likely serve as landing pages or download sources for malicious payloads, potentially including remote access trojans or other malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929ad44f822---37308566017.pdf In PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/68f43699c5310f34e429026a9afc23ca/45114030805.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0bed60a68---tipodolafuturukurinurawa.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/putaforokugenekajobufojif.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/verivoranagefimoza.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/patax.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0f6eb64b8---jezazawitodujomiwi.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/e45cbf95ec5337812d0a56890d42d581/fopolijaruwuxepexupozuxup.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/lokepowof.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/jamajabiwuxe.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/drmprm8i32o6i4322afk4rmpo0/9767213294.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/jimilo.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b45631587fd---mepenejitixep.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/fisum.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841cc405c13---pabunenixageruwalegiwaguz.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/99144461542.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/~3/1xuhb7AK25c/uplcv?utm_term=download+berry+rushPDF 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_off0000d00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00A 5244 bytes
SHA-256: d24d8b0726e1ce8a401caf8da17353f343e727e9b32c32d0a98d1de37abc19e2
font_01_sfnt_off0000e1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EC 12232 bytes
SHA-256: db90a9ea3652a26398460a689409a3e48db44529b8863588dfb4de35cf91f5b1