Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca52750642b67a9…

MALICIOUS

PDF

69.2 KB Created: 2021-09-16 21:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: befaf5cc5e1229eacdd48ac9a0b90015 SHA-1: 6d8c0000cf23920f0433f37d5a796e68c69c45bc SHA-256: 5ca52750642b67a9afdbb48b325f5a04b6c5184868b9c5ef3140b8c14c353d1c
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that act as a link farm, directing users to potentially malicious content. Several heuristics indicate that these links point to compromised websites or host further malicious PDF files, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=latest+android+emojis PDF link annotation
    • https://tavcam.com/upload/ckfinder/files/24009403612.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343978e0844---77311484475.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135f4e4372c8---pukiwupuzexefobupagunu.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/30628054955.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/23424294195.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/foxutas.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fca98ed048---zojegefujiwexorupiropas.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/lenugugefigebesupi.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/51130639284.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/sinetejosakesiragefep.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/78727764017.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/12251269364.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/7557026228.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/sububeder.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/mowotasitobep.pdfIn PDF document text
    • http://sro52.ru/uploads/files/53861708603.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/36956551115.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/givarubifuvatojeruso.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/bapuse.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/wuvixuri.pdfPDF link annotation
    • http://eltdb.com/UserFiles/files/5028727652.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/65977968270.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_off0000b43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43A 14436 bytes
SHA-256: d7ff2d6d727308731b808b5e52dea39a5c6d8a28cbc82ab93a079fb5705ed5de
font_01_sfnt_off0000d7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DC 10452 bytes
SHA-256: d91641c0a6a47eeac89c03e09674e8ab7c05d06b5df9598636ab7b0093cf6578
font_02_sfnt_off0000ef83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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