Malicious PDF — malware analysis report

Static analysis result for SHA-256 eacab1cded846eee…

MALICIOUS

PDF

78.7 KB Created: 2021-09-09 18:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f82a2901787c3f1d01f0193878f09f44 SHA-1: 792d3be96a48671aedae365d98147a7f07cf69d1 SHA-256: eacab1cded846eee01106ab07105167a26356f7930dcf8c3cef7567f192c7d8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=ramanichandran+novel+free+download+in+tamil PDF link annotation
    • http://symbioticlifetech.org/attfile/fckimg/file///2021090531729_494409827.pdfIn PDF document text
    • http://abpaluso.com/upload/file/47517693671.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16132af323d2e1---lejalegugenonib.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/fopizozejalibodud.pdfIn PDF document text
    • https://jobtiara.com/files/files/sawugas.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/29406667172.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/73224630815.pdfIn PDF document text
    • http://retailcop.ca/files/mivopudilawubik.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/rowodeten.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/13030363711.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/7051236060.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/ziwowoka.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/davarebozomifisulez.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/sotezawigolesitudupi.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/totatinu.pdfIn PDF document text
    • http://misbahelmudii.org/ckfinder/userfiles/files/zivuxamoke.pdfIn PDF document text
    • https://oasis-travel.ro/files/64458879762.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/98533702624.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/jilikinepaga.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161301ed85559c---23949409156.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341aae685bb---65026327672.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/butisizutigarix.pdfIn PDF document text
    • http://krupongs.com/images/file/tuzapu.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/butulijumojogu.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_off0000d09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09E 16936 bytes
SHA-256: f1a42651968422edffd28e8f5c056686e665b37a191a0c335deec0977aeb7cf8
font_01_sfnt_off0000fc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11449 10772 bytes
SHA-256: 8a2aca6ae60227df06eb15e50ec0d12c74b2cb318b6f7b97e1665b0d40ded548