Malicious PDF — malware analysis report

Static analysis result for SHA-256 356c687b4b1cd2de…

MALICIOUS

PDF

99.1 KB Created: 2021-07-05 23:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 70c42aeed896d4dd9a38411d7d3bd864 SHA-1: 30a502f25cc0b04c5d68dade4860f653c159a1a3 SHA-256: 356c687b4b1cd2deab2ba3d0060a4e6a10e31e52b0719cd5d6a3c40d0e646563
156 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://catamma.ru/uplcv?utm_term=slow+up+meaning PDF link annotation
    • https://davaocarrental.com/images/file/39941063256.pdfIn PDF document text
    • http://vinmexindia.com/uploads/vufemobuje.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/8a6733eb39d62597c0f80c1515e3ae81/9244043510.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/14179742982.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/857cc3ded39f9b02dc1410bb1f244023/dirabaj.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/7a7070b13d31ce3f6fcc1613e1223107/25582286811.pdfIn PDF document text
    • https://flyags.com/editorResources/file///94333994982.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/rojenonozarove.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f19f9961ad---mapefowobetitewofusuzeref.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57b5a1d0e3---bamogozurefetetafon.pdfIn PDF document text
    • https://scriptdd.com/_file/file/72931044088.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/31313363118.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/zifapozujowekavofudo.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/2pdk5uvf868qbcua5eri0f4idr/sumaf.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cd64c7c0c---97165815094.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082019bde79a---58385880909.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/13643972397.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/6c40385cbc2294bf082c35f11f34c99e/73798682502.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/zifos.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8e53047c1---34121026011.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-22/20210522024845525231.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFA 18096 bytes
SHA-256: ea12264e90276fcdb889e25206815507c797ef358e55e74e6d7f02543956391c
font_01_sfnt_off00011e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B6 10492 bytes
SHA-256: 8620727ff90621ab8e8b83540c235d046e2ff84dbfbe4bb7da3542dfec6f2cd4
font_03_sfnt_off00014e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E90 16392 bytes
SHA-256: ef0fb12adca3cb0a24265e02c75169a44ffaab4855bb54b6d4ee8b7b40f484c6

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