Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7ee06206cbc130…

MALICIOUS

PDF

86.7 KB Created: 2021-07-03 16:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c5054050b2fdeb9298ab6eef8e1e2b76 SHA-1: 479cde1bef2fa7a2692553094ad82307b1525faa SHA-256: 8c7ee06206cbc130013cea2305a7c96e89910eb4a58b40b9486be994459d602c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and link farm characteristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/fde468403e6280c98329e54d449b50f8/puxobipojodew.pdf In PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f369f967d6---31861269977.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/jaduxuxojuputudiw.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021530542403075.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/895c58191f6339b58b82790a113fcf55/54692827703.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d4700944a16---45422386085.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f3696ddcb---sugiwukawudawufe.pdfIn PDF document text
    • http://computerdoki.hu/user/file/gufepuxikejefuvujuva.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/b1ad4o8l3nlnq5d36kpv9pq9k7/65157849181.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a04c0de98---rurow.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/ng37k9tq0bdooif2ssnmf6nhmn/lidiw.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/76174af5a1b92715bb9b53e1814c1b11/39986695771.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e10a9b35ba---papikijosid.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/6rk5v5ec4u1u9imc3kofsh1er1/wumukivujabijuw.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/1648346186.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/sfkqj7d560cs2l36i333thg4v0/guxemaribekebarov.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/mofudokok.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///14720686643.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c74c354580---21659887844.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/6cggoib3qddepfst006v88uopi/gizuwovewokafoko.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/l4tgdcv3mjfa4tbrrh81q2qj58/20131489378.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/79847065639.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf88ebeb51f---74372491296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=best+colleges+for+gymnasticsPDF link annotation
    • 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_off0000f03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001084e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084E 16916 bytes
SHA-256: cca2e41523174b04f130245e509d12cb840968363756b87c2cb70b55a43450d6
font_02_sfnt_off0001347c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347C 10844 bytes
SHA-256: 5d657e12a0cd9b4f1c4823400d1ad06e6f0ef0e3b8a6cd27b4e2c3f0c4152674

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