Malicious PDF — malware analysis report

Static analysis result for SHA-256 94e86f654c372772…

MALICIOUS

PDF

88.3 KB Created: 2021-09-18 02:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c87140c9ba7dfa0b47795e18d0be2031 SHA-1: c3315e2f637bb0e24b1856fecf5dcdf5d156a273 SHA-256: 94e86f654c372772620a843d3d40b6d31cdd220d97cafb952c0ad78402ce0a11
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier strongly flagged this PDF as malicious, indicating it's part of a link farm designed to distribute malicious content or manipulate search engine results. No scripts were extracted, but the sheer volume and nature of the URLs suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://lensmam.com/userfiles/file/toneboximaletirag.pdf In PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613799c0a1cd6---1308240551.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/sogojakisiminaxofotudisa.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/zudoxarubazozilux.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/vefakexowonivoronugamavi.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/77777053805.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/21419902496.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/85278259571.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/6814805558.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/sugopodujotudepuzozozu.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/86546264726.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387effac8a5---43298107705.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/92879246580.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/d9o46tig9akehmqn6nq064m3kc/55383360039.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/41745687656.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614180da492e3---34880529602.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090214043973499.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/85356778036.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/mesagobaligenolez.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/48283602357.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109121044567135.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/23078360648.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/60735329433.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/88280955584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+copy+and+paste+text+on+samsung+phonePDF 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_off0000f152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF152 11116 bytes
SHA-256: a90f822421413b2780d14d384d85d9135f6ac82e7e147887cf53359520258268
font_01_sfnt_off00010afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001230c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230C 18412 bytes
SHA-256: d99633bf843f525becaa28f8e6bcf32f77034e9a4303b2125d1d4a1a6b783f5b