Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd385cbd2a93ef81…

MALICIOUS

PDF

123.0 KB Created: 2021-09-04 03:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3b8e341bb6eccedb3c89c89163105fbc SHA-1: 500f037e4ffdb7e613230b4e8f78866860e0f2c8 SHA-256: cd385cbd2a93ef81d104a06274e875e89e968a7488cc3d463ac782d080efc8bf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external URIs, many pointing to what appear to be compromised CMS uploads or disposable hosting, further indicates a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=ejemplo+informe+pericial+psicologico+pdf PDF link annotation
    • http://carshopm.com/js/upload/files/2743947822.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/xarimubavi.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/f81f369578cb454e04b70190620cdee7/sofotefusanilizeta.pdfIn PDF document text
    • http://rts-3.ru/upload/files/44685590154.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/d96703c44d6361f4d9f371fd79e94b2f/mixabizijolesugabod.pdfIn PDF document text
    • http://haphadoor.com/upload/files/rozomazarovarezevedojof.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/85794220159.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/14344484597.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/53388a25d110d3d18172b06906533c60/79795028967.pdfIn PDF document text
    • http://epmachine.ru/d/files/bonunaseperusixovuwerun.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/zekojomutaxejutesafaro.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/pekefarusijopotix.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/lesotidekorurofemog.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210827201830.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/8473065676.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/64548986991.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/16fd36dfe071affd9f4e9cd327361aed/77379759899.pdfIn PDF document text
    • https://megashina24.ru/files/files/90078097057.pdfIn PDF document text
    • http://bscartridge.com/pic/11503802925.pdfIn PDF document text
    • http://ridendo.cz/files/file/nunoxulup.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/zavupajigomakugilufas.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/6a0bimosc1o5sv6o15isp3ld4d/tuzimaxabizakiwotekud.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160879b9151256---zuxaleparesatuzomurugiw.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/31982964441.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/jakokogev.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_off0001756b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1756B 21784 bytes
SHA-256: d9e642fa8a296f5c0d1e751e9b2a2563f17894ff833ac1738531c1a2ec0da9e4
font_01_sfnt_off0001ac83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C49A 10980 bytes
SHA-256: 92467c301100125dd435031e81845676496ddc3c793d11e750ad9c270b709782

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