Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3945ec71ce57837…

MALICIOUS

PDF

93.4 KB Created: 2021-09-14 06:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 25b50ab3b70f478169c475ae725545f5 SHA-1: 12b1c663b39896f733f0383dc99499f2e97c583c SHA-256: b3945ec71ce57837f6f2d6178b03728b4dd0b4eed843af839f33865ec566dd98
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous external URIs and link farm heuristics, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick the user into downloading a payload. The presence of a 'download button' lure further supports this. No scripts were extracted, but the overall structure points to a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=angry+birds+go+old+version+mod+apk+download PDF link annotation
    • http://novena99.com/uploads/files/202109060317107847.pdfIn PDF document text
    • http://na3.it/misc/file/sowurilezagibarovon.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/revegufipawi.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8d6c0ac3d---28493301745.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/50108562256.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/nulirugisusuragesif.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/2ukqnqlgiin373t2k2dak3b24j/53091942350.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/90903589801.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/43947018958.pdfIn PDF document text
    • http://talesma.com/E/file/livoduk.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/xubagitew.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/19203638646.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/nawewodeva.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-5/20210905065919757664.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/53463819894.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/bilegekotimike.pdfIn PDF document text
    • http://ocvitlucky.com/vietkiendo/upload/file/14167732890.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/17818557167.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/dadezevetedepilutunaxan.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/ranivol.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/hdij3i0ll714sgo4sf1o5ujbo3/regabogomibi.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-7/20210907214657838875.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be788d0c3f---92306451764.pdfIn PDF document text
    • http://kezmosas.hu/files/file/72274636317.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000e28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28A 11116 bytes
SHA-256: 8f29bfedb4af13d25996402b7bfb20e53226862fbbdd536a7d7ec1b06f3f4531
font_02_sfnt_off0000fc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001142a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142A 16436 bytes
SHA-256: 9c9fe628df5ae658ab12e8f16704d7696578e84ce2662b19f8744af5477eb687
font_04_sfnt_off00012afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFA 22916 bytes
SHA-256: a9cff2aa7e5d85335b58a6ac0d9536a1635b23802efa820fae4fea083435f239

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