Malicious PDF — malware analysis report

Static analysis result for SHA-256 f749eb1dd4607af8…

MALICIOUS

PDF

72.7 KB Created: 2021-09-15 04:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3e4032757f1e633b3d952c3b7068cc41 SHA-1: c49d45f2f661ecfbaf32fe57caf134ad8e2bccab SHA-256: f749eb1dd4607af8876a3338d58fe13ecae55d08393ad1b5a5fc9ccaac9b631e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141124197f63---wokatome.pdf In PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614117be93a83---24159490608.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/zepilixuzog.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/07/file/20210907_052351_200.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16135805de3f0f---jivamizejavo.pdfIn PDF document text
    • http://baove24h.info/upload/files/44332058856.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/puxivenogadejelutivus.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/21125181941.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138017c07575---53868536583.pdfIn PDF document text
    • https://seerupit.dk/assens/file/xotomalivunodaxitara.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/zojulexagipodelidagavaja.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/38055741393.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109120624536966.pdfIn PDF document text
    • https://ikansambel.com/contents/files/61774800825.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/saduwutogebubu.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/78771271289.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b629291cf6---tazolixitefi.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614138172d87c---zatewup.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/92651800768.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/vilasakawomudepilam.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/10257596561.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/genegirulari.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141232cc629b---xarupopoxipifosaninu.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613143f76ef67---58765723819.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/23028094842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=remove+injector+ml+apkPDF 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_off0000bbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EE 10700 bytes
SHA-256: e0be3b25b9c63086454740a2815df14c07ac47095610acbeb01051a8c72fcb59
font_02_sfnt_off0000ec6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6A 16380 bytes
SHA-256: 5ad7239bfe49a47fd89d5af72f6bf98bfa1b46cfbd7c9e7d39e1daea01f74206

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