Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b44a1090505067c…

MALICIOUS

PDF

75.6 KB Created: 2021-09-07 10:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4a39fb8eb090500877178d90a2b8cd2e SHA-1: 8963e4bea8d96bb5b4d31ff20a8b5f77394f1048 SHA-256: 4b44a1090505067c41bc6817a9568c4c8c3e54cc3f80045aaccb89901b65849d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms points towards an attempt to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612bccab9c229---55801356235.pdf In PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/rezurajiduromixut.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/28734928208.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610cea4619c72---biravutujapavosefavowez.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/nazamivevuvisakijovisexax.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1ae3015dc---basifinanu.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/60039345030.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/72729622213.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/kufukakarer.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/87088158562.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/9ea468280d6432e8baf6bd2a9d204970/83957742356.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/592b11918f7bb507644b100528478632/riwujupumufepopovuni.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ec0dacf8e5c02b35ab433f85a3358e1b/bobirolubo.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/78292018632.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/27630058386.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/bevajidi.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/91122354249.pdfIn PDF document text
    • https://soechi.com/userfiles/file/45609260711.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/nomomidejivujezi.pdfIn PDF document text
    • http://freeorden.com/media/file/bopasadatipitoxew.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/81043794543.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/75666158383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=hexagonal+pyramid+net+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_off0000c563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC563 16440 bytes
SHA-256: 5173a372f1aa1f1fb6167e3e85502a6f49e34b8d54bebabd65ea989ddc35ca27
font_01_sfnt_off0000efc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D8 10880 bytes
SHA-256: faa2bdad3e46584a5dae5f46e46e2358ddb91031aad5127577d65bf8ab030bfd

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