Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4fb94809932bed1…

MALICIOUS

PDF

83.0 KB Created: 2021-09-13 13:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8b1ef991f5d8ad630b0d1703d5ed1073 SHA-1: 5892ecf7c7ba1ce9100c3fd9e7e49b71dd8de5b1 SHA-256: e4fb94809932bed1e5fc787f3ced0263db62326c824168c199b967ddd9d4db15
164 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/4792bf435ea8b814cdea7710500d3802/13006046558.pdf In PDF document text
    • https://mtmnetwork.net/uploadEditor/files/pefepagupugapirot.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/wokisifetigu.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090610272973499.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/dodifubimuxidap.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/dizujilanemupusewew.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/rumumaxi.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/12952983580.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/powedomadejokuvazoke.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/bovigitopenafalatajuvoj.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/fipomuzunagarupagamumi.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/jidewina.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/77460826236.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136d8df708c7---jizavarutomogex.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/pererilewuwi.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/nidatevep.pdfIn PDF document text
    • http://sjanzee.nl/file/gatoxatopi.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/130609187967.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/tipozikosarelekakaxufe.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fba765056b---fazurazojoxam.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/44364109176.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/rujujobejipipabi.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/zomor.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/64604110041.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/5fa20bdd24df6060461f5f790b027780/zofewufova.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=download+apk+lagu+dj+mp3PDF 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_off0000de6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6D 18636 bytes
SHA-256: ae4e0f6daffa6624146e53d1e6638a3f59aaf702f07c38c405071dbfdad19022
font_01_sfnt_off00010e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12680 10728 bytes
SHA-256: da6d5700bf9cde4041045fe7a0f0950f4203a6808a8a136b57b0470e1d263b13