Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d68e90765a00675…

MALICIOUS

PDF

99.0 KB Created: 2021-08-05 11:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91cfd7521127bc26eb00331852ba16e1 SHA-1: dcf76db3e04e6988f35ca141ea1bfae68501ce79 SHA-256: 9d68e90765a0067518baa9645d25b3a6eab210211cbe3d7d6005b8c9692bc372
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV both flagged this file as malicious, indicating a phishing or trojan-like intent. The primary function appears to be directing users to potentially malicious content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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 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://allseasonsart.com/uploads/fck_uploads/file/wibifotoju.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/156876872824ebfddbce45327b6a287a/muroxanopegixogola.pdf
    • https://saleskerala.com/ckfinder/userfiles/files/duwodudoxiwulezurabesaxat.pdf
    • http://chapelguild.com/images/usr/mojowadizoredurejez.pdf
    • http://lg-palette.com/upload/files/joruxedeb.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/722fe86c2cfb5789008c2167660514d7/68524414611.pdf
    • http://luxmeterthai.com/ckfinder/userfiles/files/savebi.pdf
    • http://locum-system.pl/userfiles/file/sajizowafojofelavig.pdf
    • http://crisismobile.com/ckfinder/userfiles/files/74842760629.pdf
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/velubapinukarovaxad.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160750b17b1c5a---pupilamenigefid.pdf
    • http://debden.org/userfiles/file/32258226393.pdf
    • http://kemenyseprosiklos.hu/upload/file/kevinuletodovogerixidakul.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161031309a210e---98198408038.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/142c22cba0fbc9cac4d8905c5659a2f1/xozalolapofegokofi.pdf
    • http://richmediahouse.com/admin/uploads/file/nalomewawakivefogilasipi.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/c006a437a453758c2b108fd684480a3b/76127363962.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757939d7d65---35628530907.pdf
    • http://terralis.eu/catalogue_dynamique/file/jigajilivofojomif.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/a218217658bfbdf9468bc09c1e939efa/88966633676.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/8012cdcded495b5a90193ed1e2f0933b/fososirosutimamubizijuj.pdf
    • http://kino-cosmik.ru/sadm_files/bobenidomewesifipetadoso.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=afara+e+frig+song+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d47.bin
fb956e58953dfa60bac99fedfd1a31c94d3a47e4cb03c11c9bdea006ab9f81af
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D47 18624 bytes
font_01_sfnt_off00014d70.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D70 16792 bytes
font_02_sfnt_off00016587.bin
cf8b97707ba10490bd5730ddd17138f5341e9e25efd35b0bb121c038b80a2b39
pdf-font-stream PDF embedded font (sfnt) at offset 0x16587 10496 bytes