Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a50a841a0869d5…

MALICIOUS

PDF

89.4 KB Created: 2021-09-11 05:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4de646d6ec8620f9b885575ec33ea22b SHA-1: 295d6e50ae6380deb6fdc3072e262f7cedd7f74c SHA-256: 43a50a841a0869d5090eeb3277b6e4bf4cd8bd2f8e7716e2bae511cb02c4476f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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://pixomot.ru/uplcv?utm_term=hotstar+mod+premium+free+apk PDF link annotation
    • https://nocnepal.org.np/ckfinder/userfiles/files/biwanowuxokunaxibirapower.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/lunarivutedekosuvevusuz.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/widisoz.pdfIn PDF document text
    • https://unaizahic.com/Files/files/tananigusuvawodifok.pdfIn PDF document text
    • http://balone.net/_upload/file///minifuxobik.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/10544946840.pdfIn PDF document text
    • https://securitydm.net/slicice/file/narotupikovurunej.pdfIn PDF document text
    • https://atrax.hr/files/81757643243.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/93441321558.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/82525944496.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/3556310945.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/pafinonedunodevanoxe.pdfIn PDF document text
    • http://boki.hu/editor_up/74241388589.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/98626767670.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/ramiminegoro.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/86188751283.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/96c806e0fb0ea58fac1072feface3034/lamewovelobazuxegu.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/19020723128.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e8aa4723a---58790744410.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/fetuputisaz.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353fafa5a85---89152008969.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/27103219941.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133f8f4746c8---41467215741.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/gsbrlit5839lhded3hukksie8t/romefikezeverinixekus.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/lojumojotixofisun.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23C 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000da34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA34 21696 bytes
SHA-256: 2f848219693674ee4d2cbede074d15e7f712bd0fc60d4258fcaf87f68fdf0af7
font_02_sfnt_off00011128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11128 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001293f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293F 10692 bytes
SHA-256: 22af29f38ed3e7dbd79ac846b3a3fb3b1ffca8b43bf0d64c22c45423e8cf2672
font_04_sfnt_off000141c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C9 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f

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