Malicious PDF — malware analysis report

Static analysis result for SHA-256 405ac2bda1e3d8cc…

MALICIOUS

PDF

71.7 KB Created: 2021-10-04 01:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d3fe2d63a6e854ba57297bf2c873a55a SHA-1: 747e6762938a1e26e06467642c2d9e5dce983aad SHA-256: 405ac2bda1e3d8ccf9f9bb509303039d1992ef211fc73d6ad8efa01cfff8d43c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to a raw IP address and others hosted on compromised CMS platforms, suggesting it's part of a link farm designed to redirect users. The presence of embedded URLs and the PDF structure itself, despite the lack of readable document body text, strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://huntic.ru/uplcv?utm_term=joint+commission+standards+2012+pdf PDF link annotation
    • https://charterboatdeliverance.com/uploads/files/91948525823.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/26477307965.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/87396263049.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a29bb4b679---guwojozasigegafirorijopu.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/mimol.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/77802182815.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/88775011626.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16147e8e3ae490---vedorunojexubi.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210911045920.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/vevazawil.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/bupodafifipikepuxi.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/sigidus.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161544b1c18d30---71806042933.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/rabagifuvisar.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210901_052009.pdfPDF link annotation
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/da54648c1125403b1924ee4264252fb3/40568666274.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/50477304699.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/nigonatotir.pdfIn PDF document text
    • http://tasfor.com/files/galeria/files/698599316.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/bipezifeledejelob.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/begaxogoj.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_off0000b327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB327 17324 bytes
SHA-256: 30b5502efae242848804a994db318d29656904506e2de3f42b790fd74219e9b4
font_01_sfnt_off0000df7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7A 10888 bytes
SHA-256: eba3c2b7448ec0cee7ce6999efba85e421b85239f9b96414d3bf8dcc29444b46
font_02_sfnt_off0000f8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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