Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ee37e3266dba00c…

MALICIOUS

PDF

78.4 KB Created: 2021-09-18 05:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5d7ca8fabd9290664e99a95905db6426 SHA-1: b73a886331d086cfb226419f65d7300af55834fb SHA-256: 9ee37e3266dba00c7c45315cf160de343033069d776bface507f0d71724cbf65
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm. The primary purpose appears to be redirecting users to other malicious or SEO-manipulated content hosted on potentially compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://clinicaveterinariasangiacomo.it/userfiles/files/99227838891.pdf In PDF document text
    • http://tano-cable.com/d/files/90204528637.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/54896771118.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/78908778659.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/52992783009.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/34874399935.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f96ff314f0---98181773372.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/kiwotesax.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/abf25b5320bb17fbb435dd9498267489/54083355540.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/solalorapumajefunasit.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/1929948749.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/jovut.pdfIn PDF document text
    • http://gapp.fr/medias/files/75142037605.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/58534086363.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/88820007650.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/wofewevomiputetiwek.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/44489683407.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3dede30dc---63979161182.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/vufodelof.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/80394566546.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/35750054486.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/50105322.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136cc9aec136---ritobulagas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+curious+writer+5th+edition+pdf+freePDF 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_off0000cdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEB 10792 bytes
SHA-256: 85a031e3ad059341e07a1a5affdfaf04359389c1d39ec42ac229ae23d52b1247
font_01_sfnt_off0000e6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF2 17252 bytes
SHA-256: 078985af3983cd4ed2fae35bfcd57854c576f7efeb8169fb4e5febef9919c57e