Malicious PDF — malware analysis report

Static analysis result for SHA-256 08277cf0a1ea517c…

MALICIOUS

PDF

88.8 KB Created: 2021-08-07 13:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dd2884cc789810cdba9fab918d5e9378 SHA-1: 53718f210959d57e203f20d518614cc57de94902 SHA-256: 08277cf0a1ea517cb1d859a4c4c443104ac33698e1127f5b0178cffc8b0468a7
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 upload directories and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/7f95ab19270476b74f3225921089e41c/71296350022.pdf In PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/duxazodaletapevidokavoxi.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/53474560309.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/2966441147.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/legasawogekenibuginete.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/gatafebazalibuvurigawopem.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/sevetawixoxavo.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160871f2bdfdde---85322676943.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/derutezekegagapujovitis.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sufiwapenitexusinula.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/gerev.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4708e6dab---roruzofeliko.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/31358852984.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bb617246a---liwutafatazupudenowojino.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/76652470210.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e48bac714---nizimux.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/kinunaz.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a5e281420---mipiz.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/48735410215.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16082a9a686889---50857242680.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/16551884132.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/a2b7ad4d2c8974799573244b1f832343/2217707231.pdfIn PDF document text
    • http://redactron.com/userfiles/file/ramiraf.pdfIn PDF document text
    • https://auto826.com/uploads/files/13643066358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=crazy+craft+3+how+to+get+rid+of+cursesPDF 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_off0000f914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF914 11168 bytes
SHA-256: ef711c1e28caeeae9711d8242c3d40d013b650215cc19ef56259095c947e3a73
font_01_sfnt_off00011356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11356 16516 bytes
SHA-256: 1024be9ae2f97042d6e27056a504565e905bb0cd594a134bcc308f1adf36316e
font_02_sfnt_off00013e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1