Malicious PDF — malware analysis report

Static analysis result for SHA-256 b742491536afea8b…

MALICIOUS

PDF

74.3 KB Created: 2021-09-09 19:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6b62519d7975b9d590586ba91989baa4 SHA-1: 51a785e1ad0f879e4d7e5a538117472f46db6111 SHA-256: b742491536afea8b64d1481b27415d55b845777f0af07d827e0e94bdaa8caac3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161359d8d46570---72893291306.pdf In PDF document text
    • http://www.deopendeur.org/imgUser/file/30504769878.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/17233091316.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/sutiv.pdfIn PDF document text
    • http://milliondollardesiclub.com/upload_files/featured/files/pugivusowetafabijom.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/76208813794.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/83185957882.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/83646032641.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613248d7999ec---suzesidobibinin.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/65018113503.pdfIn PDF document text
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/zurazekafidimo.pdfIn PDF document text
    • http://lg-palette.com/upload/files/gijojup.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/didiwenakif.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/jikekekuriwima.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/liwogovuritaka.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/fomoramefoxixakolu.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/butiluvenovorufinapidafi.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/50162374609.pdfIn PDF document text
    • https://huanghecables.com/d/files/pinikupoz.pdfIn PDF document text
    • http://ud2-140.com/files/49875792416.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137c775d102c---18840864575.pdfIn PDF document text
    • http://canvangdientu.com/images/file/ronifiguresa.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/13606693839.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/wemojam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=real+drift+car+racingPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/daxewinunarojopeko.pdfIn PDF document text
    • 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_off0000c118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92F 10408 bytes
SHA-256: 974e964deb16fc6553bd70f30155f09f3341e75fd8ca1efe517ccff7c7d8da94
font_02_sfnt_off0000f095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF095 16756 bytes
SHA-256: f029689743e5eebf825ac22aa62fbd3265285f867123ca6ed08cbd661264e87b