Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f247f2b53234359…

MALICIOUS

PDF

88.2 KB Created: 2021-09-03 18:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 84dfc8f06a07c44367f03b50e2bf1c27 SHA-1: 0f790d1187a79be07e8532c754915c234c31681e SHA-256: 0f247f2b53234359b2cec1be526b0d3302df61ec413c3fbd36e2042b87f8369d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a link farm, containing numerous embedded URLs that point to compromised CMS upload directories. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm on disposable hosting. While no scripts were directly extracted, the nature of the embedded URLs suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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 http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bf6038dfa---majoz.pdf In PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/qbe1l05sar4k51j2ujq48q4um0/ranararodirap.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/44364946482.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/zuwad.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/uk3u03hbjiu1bhuvtkok5t0fcq/zixupa.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d85e230c50---togiluk.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/bemixoriwuloditom.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/40195356755.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/61829736262.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/a2c06b515c8869340b1de7db19d78482/novunoganowesusapajavuka.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/44398093827.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/79022497152.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160828b7586268---retigofemo.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210607_3B47C2C01B42E758.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/xuvulamabewozixewogonugu.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/37359721812.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/38070780546.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109010138427093.pdfIn PDF document text
    • http://gewald.ru/content/Files/13144552747.pdfIn PDF document text
    • http://thegioivaigiasi.com/Images_upload/files/rawijukemuvinutoresa.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/89462307344.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/1584201686.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/21077143285.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///nuvew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=industrial+%26+engineering+chemistry+research+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_off0000f38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38B 18876 bytes
SHA-256: f7862874774f824405c2785b1b1189ffd337e651bdd997aeea41f97bdec461a4
font_01_sfnt_off000124d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEE 10032 bytes
SHA-256: 0d550dc47d0c41a65dea7a5e62dd40e5c26f340c6d28013cdad851d1efed5707