Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ae76d7fb5204bd…

MALICIOUS

PDF

73.2 KB Created: 2021-09-16 18:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c7b4ab5364cecb8c2373045946cc7e47 SHA-1: 7185c0ee170805a4cfea6f4734200f68085f7bb9 SHA-256: 37ae76d7fb5204bd35501e7fca46111e455f990b2ebcf01a06a199982639ec42
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the overall structure and URL findings point to a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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 http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161307808c8f18---nagoteraf.pdf In PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/munenu.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/bozado.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/wojutobibabezorobomiluli.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/45594492491.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///jolavudewupejomuzovagiza.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/tufawadenijinoz.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/94183410019.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613644efc0e5c---8979927512.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/334ce3c0f5e498f40039d727e61344f1/29129604733.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/65193274233.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/62892554869.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/76286609479.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/bozum.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/pitix.pdfIn PDF document text
    • http://tyextractor.com/d/files/55525297289.pdfIn PDF document text
    • http://wenxuezj.com/images/File/77680630433.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/dovijirulober.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/lezemepasev.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/25839495720.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/34111927805.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/saruvusedowevefediv.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/samibifapasafebivisal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=essentials+of+international+relations+8th+edition+pdfPDF 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_off0000bc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC86 16100 bytes
SHA-256: a083f13b7637da37b94d7098bdae012f2f31bb5b5ee913dcf913b757ae311079
font_01_sfnt_off0000e59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB5 10784 bytes
SHA-256: de706e69fdf7a205c912dac356166f5d70af45b98d4500cf998e528ef8bd91b9

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