Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa1a9a3433eeeb8…

MALICIOUS

PDF

84.1 KB Created: 2021-09-08 14:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f2a515c2f0d7bde703bdd6bd463371b1 SHA-1: e75a3aa61ce106a2534aa56b4e1a8dae81e83022 SHA-256: 1aa1a9a3433eeeb8c1a14296576899b5b88cd1fc4ec08fdcb0f1d6071df4f874
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phish for credentials. No scripts were extracted, but the heuristic firings and URL patterns are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317c4b20095---95128570642.pdf In PDF document text
    • http://baove24h.info/upload/files/danagidowumebogetarub.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/78250939431.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/88654965086.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/kexewixunusasexabowud.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/37230518276.pdfIn PDF document text
    • http://vuason.vn/upload/files/53845507707.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/sapipudinonupukebox.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/82709858598.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/sitilitatazobotel.pdfIn PDF document text
    • https://abss.pt/userfiles/file/milumar.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131730917820---1621253003.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/25801912496.pdfIn PDF document text
    • http://rooptex.com/uploads/34505228096.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/texokisebomozanuj.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/38484853217.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/1292394525.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/tuwokuxevogarilaxofur.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/55622613125.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/85560708632.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e996282101---wemov.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/napur.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612feef8a2e5d---fusojerazosenepixa.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/22906333702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=the+drummer+boy+by+cyprian+ekwensi+pdfPDF 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_off0000df15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF15 19624 bytes
SHA-256: 1d0e9d07f0da0eca5b1fa898fdd5cebd46f62e9509cd87a6387c7a1bf69dd5f6
font_01_sfnt_off00011063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11063 11236 bytes
SHA-256: 57f3c7e3b1b5c34f22508f52be68ebb4f1e361308a9538787f8421f5ca0a3ae2
font_02_sfnt_off00012a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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