Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0789a0ffe5c9475…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 21:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b8cfcc31952150821326a7d91334cf53 SHA-1: 7ae898f17ecd319c979914b48ed188d6e10d79aa SHA-256: c0789a0ffe5c947586358cd493ff17cac4ff7bf6a8380bd6b09758a7653732df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external URIs and links to compromised WordPress uploads and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for information. No scripts were extracted from this sample, but the presence of multiple suspicious URLs indicates a clear intent to redirect the user to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://medvor.ru/uplcv?utm_term=alan+alda+book+pdf PDF link annotation
    • http://edison76.com/clients/5/54/54c13950cbd15a81e6fb4362eab8f273/File/bagarexu.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/be38494dabe4b37e9dafdf38db5af822/lupuzizakakiwofofodozinom.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/7961185109.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/veforufoken.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad56c20f4e---tepiwolovasorewataj.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/xodutorenezogonizusudemow.pdfIn PDF document text
    • https://securitydm.net/slicice/file/42995964780.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/99185827018.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/romagezo.pdfIn PDF document text
    • http://surestegc.org/documentos/file/sefuxigenilen.pdfIn PDF document text
    • http://topas.lt/userfiles/file/siwamotaz.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/96831992318.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/voner.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/23898743ab46c65c71b36dad7d699fdf/pijanijumuzogegediget.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/miwajuvixozerobujale.pdfIn PDF document text
    • http://isvpro.com/custom/files/nulomevamuxoreme.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210630173137142108px0pk.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/96330365386.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/fkano9dp474kv7ut2lhhi1fr72/7662097525.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072ef2ba88e7---38007868208.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611370508473a---rikizuzufumasavidonibam.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/xegepalo.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/dalixofawogew.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606d30b865c79---kipelefeduwowajo.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/e848bd9d3b249c63388bb5864b472b17/ruvemufikeperazafudazetu.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/bitogudibiruxabi.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_off0000dd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59B 17912 bytes
SHA-256: 0bdf9f30cc2a573496dd899a6ebc168cfaeb81ba70ec9eac77acea61aee1a6a3
font_02_sfnt_off000123ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FF 10116 bytes
SHA-256: 7e33e69f9955a1e0adc4fd26f822f21b66b032fe56e52d346b3003f617c2d122

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