Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a4c4150a012e36…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 05:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3c5d718ad05a7e00624d39cd771497e9 SHA-1: 99044b82c7e81b8a0f91d8b8f08ff8fc4564e3bf SHA-256: 05a4c4150a012e36fa26022ad510b1e2ecfdf57186cea1b93362861a895cef66
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or redirection scheme. The embedded URLs and the nature of the heuristics strongly suggest this file is intended to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a822149ea4---samiralubage.pdf In PDF document text
    • http://strahovka66.ru/userfiles/file/kawoba.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/79828610568.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/fepoxolefa.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/rofatix.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/252a6e02973102f5189eb22c5847e40e/85069419754.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/96457284021.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/dimetosavuwokewugivov.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/fumanupebizepafotaboxap.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110705254d92---ponamofojuwuz.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/s7csarb6mpi10635eogirdtcec/78681746708.pdfIn PDF document text
    • http://tms-operation.com/upload/files/girikixanomilux.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/koxisofokunavovabin.pdfIn PDF document text
    • http://museeducuir.org/upload/files/6644868857.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cee12a343---30402100713.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/c15c31cd469d7b8feb7f7ceae18c57d4/pifujezofagiwitifoves.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/fogitarijuvaxunago.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/61182585275.pdfIn PDF document text
    • http://pjteam.hu/uploads/sosegepamagonefudotozij.pdfIn PDF document text
    • https://emprenderem.cl/files/lezaranexivugibumizuf.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160878ae43c0b8---remabusejosevupi.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/liranizej.pdfIn PDF document text
    • https://tl-systems.hu/files/files/67177059838.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=kite+runner+chapter+21+quotesPDF 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_off0000dc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8F 17416 bytes
SHA-256: 45c025209800954e3ea03dffce4468faeb272a2f4ce5e35397abf979324a2cb2
font_01_sfnt_off00010969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10969 10836 bytes
SHA-256: 0cfeeedb4ef14da47673fc18e3b3bc4302b55e228be4f7aa47c98b281e2c92e0
font_02_sfnt_off0001227c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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