Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a82366a41a6c8ac…

MALICIOUS

PDF

84.2 KB Created: 2021-09-19 23:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18a6ddff087e2b5b93844aee2f793d20 SHA-1: bf8ebfc399ba2947366b615ad77d45e77a04fca6 SHA-256: 7a82366a41a6c8ac2e6249a5ecc64982816b7cf125071c88940c43191cd38b49
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://irlanc.ru/uplcv?utm_term=bocaue+bulacan+zip+code PDF link annotation
    • http://futimisdev.com/userfiles/file/pogomuzorag.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337f51d0e09---xixekofo.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/36512737527.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/60206871006.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c518f1d8a---45122770503.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/66457930637.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/60580670472.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/rizifoxasowag.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/15755111743.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/58024065503.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/tobosetujuwebunutudo.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/98564118502.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47353100910.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bcda391a3---wuratekunubat.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/70387727584.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/3709317668.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f13b348919---viwomiruliwoladoxef.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71294167111.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/puzufebemubopi.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161436047cd350---dajosumuvi.pdfPDF link annotation
    • http://gfk-schwimmbad.de/i/File/febakasezinovikek.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/91303345981.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/nogume.pdfIn PDF document text
    • http://pasaru.com/upload/files/miwajelodekuvakepebedej.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/boteruliwufodoratix.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_off0000e410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 10492 bytes
SHA-256: a36f0849ace741f760bc302482b5a9a651e3026425c4e9569f56d9e606c63e9d
font_01_sfnt_off0000fbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC2 18100 bytes
SHA-256: 929face46ee3ea4707790e12b14b4c49cb7f54cae02b36aa125fdd85d590a1ea
font_02_sfnt_off00012acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1