Malicious PDF — malware analysis report

Static analysis result for SHA-256 37aea4003bbeab6b…

MALICIOUS

PDF

77.7 KB Created: 2021-09-11 03:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: af0b6718aa637f5ed30028452b481c95 SHA-1: 647526780ab720857c384377f318beb8df31d2cf SHA-256: 37aea4003bbeab6bd7f3c0e28b2be736ecc9374c734ad294713316802d9cbcf9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads or disposable domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL distribution suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://pk.mo/userfiles/file/dawupuwudikozukuxajumuzi.pdf In PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/sabubojajil.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/87287924902.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/22438735844.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/1885902174.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/65929059932.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/68301885169.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/91459749091.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/dewawa.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341ee4d8e6f---fesavive.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/depijowetovitezedafipule.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/78384956066.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/pelaw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613117af395c2---jimubovoxiji.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/46048519599.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/51988747765.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/12857130116.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/38634521873.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/10097233977.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/sadepiwiduzebi.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/kojogevoritoxuxovapa.pdfIn PDF document text
    • https://satesayap.com/contents/files/fovifotin.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/ketemaripafesixodapev.pdfIn PDF document text
    • https://mediaskills.rs/files/4395069212.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/64519365074.pdfIn PDF document text
    • https://campermagazine.tv/public/file/61005008901.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138ea35195a2---saponovirokeferamowekige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=taiwan+vpn+apkPDF 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_off0000cec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC0 17120 bytes
SHA-256: 0a206d934defaf2e7233a3d66d65b8f4623b5f7c838c6f926013d823dc33f1eb
font_01_sfnt_off0000fb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11383 9788 bytes
SHA-256: 61d4308c727380b00f12125fa62dc084d34eb1b9768ee0490e5d5844de6a56a0

Open this report in the interactive analyzer, or submit your own file for analysis.