Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5007620686e3689…

MALICIOUS

PDF

91.6 KB Created: 2021-09-19 03:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8c492d8ccfbd5259ab12e21faa963993 SHA-1: 3fae9e9cfcdea53ecfe8a36f6ead740035ce2b2d SHA-256: a5007620686e368917c1d6773e20ec1820160e1daf826eeb041e1601bc52800e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external URIs and is flagged as a link farm, indicating a phishing or malware distribution attempt. The presence of multiple compromised CMS upload links further supports this. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://ketchas.ru/uplcv?utm_term=among+us+gba PDF link annotation
    • https://mosconi.net/userfiles/file/fevalemusili.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/84824771483.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/pisabexujaxivulobate.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/1796419170.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144fbb693b84---gogurasatom.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/sb5d82s963tbni41d4umhcm3ef/noxediwupibitowigenenod.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161459af7b0f29---bavimupetetakux.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303319e5518---83774822367.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/4e02de79f8d4dc3b9b4a791958fb34b4/givaxojipilo.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/siwidexu.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/97886533184.pdfIn PDF document text
    • http://talesma.com/E/file/motofusabud.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/timubevimo.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/73047427952.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/44074270911.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/simopobibedizu.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/gironizozesote.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/99361006626.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/fetatidekakemosa.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/97922520964.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/fowatoduvejasowevokimoje.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/6805195476.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/lirewegavomixi.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_off00010028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10028 18824 bytes
SHA-256: 19027775d6639387f286057aa7c28d3934a51c3cd025ed13f70e628d458db05e
font_01_sfnt_off000131f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F8 10204 bytes
SHA-256: c240e08bfa37259289362884ed2fa0644bb2c9c6924a3033d63ef3f5052a11ea
font_02_sfnt_off000148dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1