Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3f7658fcd757f8…

MALICIOUS

PDF

79.6 KB Created: 2021-09-19 14:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7a707793258019b75c36d5e9798d1b92 SHA-1: 22e440cf305a7fcf64ba89f4c705d83fa7746f6c SHA-256: 0a3f7658fcd757f85310c093603752cb22c64e0dd097eeab237a23668abb257e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The presence of 'utm_term' parameters suggests tracking or phishing campaigns. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the phishing and potential malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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=sex+porn+games+apk PDF link annotation
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613076cee6106---ratazizufilugagom.pdfIn PDF document text
    • https://kawanmto.org/contents/files/benefemozof.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/23052626348.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/78571814737.pdfIn PDF document text
    • https://krusomying.com/data/file/rinekodu.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/zipik.pdfIn PDF document text
    • http://atrsara.ir/resource/files/2029852043.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/32201620577.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/7424046819.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/21438900526.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/857243b8626e935f6287461ab61a16f9/lapudij.pdfIn PDF document text
    • http://telektrans.hu/editor_up/zejobewurapumiwivibadoxim.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/pivotutarevix.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/36453432830.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/51661665203.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/wuxobetilanitejolijatose.pdfIn PDF document text
    • https://sainaudit.mn/File/64769354349.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/rurifaxetotige.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/25685708798.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/9b713fa73adbd06f92adf4d0361d11d4/7553182064.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/pazajebutokuxebobirok.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/24769485388.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_off0000d642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD642 16656 bytes
SHA-256: aec1ac96c482d1eac96d49fd31ec24eeaae0c42b33886b59ce397aea21ac57c6
font_01_sfnt_off00010159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11970 10628 bytes
SHA-256: 689d453d5cf7901a354eaecf515d7844d17a457921ae62d3161471834f1e735f