Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9b25dff684934c…

MALICIOUS

PDF

85.3 KB Created: 2021-07-25 11:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d5a751c0fd431d549daf3df72f3960c1 SHA-1: 9cf9e1f2c2d27e013d5270b7d68a2b20854881d8 SHA-256: bb9b25dff684934ca52fbf86b4bda2a1211f889f34ce4d7996aa1bdf6305fa74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic point to a common tactic of using documents as landing pages for malicious redirects.

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 http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/smjo7v9sbjhd0rc3391b71a2m6/vezoximulabukobukisebak.pdf In PDF document text
    • http://bhk-aindling.com/userfiles/files/16012082885.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/kopazux.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/rizovokuw.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/32657887229.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d4aa40645---47484107318.pdfIn PDF document text
    • https://sanidom.pl/img/file/dujogonomujixa.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/8501245392.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160806a2b49c13---89870027814.pdfIn PDF document text
    • http://land89.com/ckupload/files/83813899542.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/343183a18c4d264dbdf9d93d1e595d6d/vofulo.pdfIn PDF document text
    • http://grandbarnettfamily.com/clients/a/a0/a01b80d98e57c38af56892ab55e7d82f/File/12916356509.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/zulowoti.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/3944458225.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/20528837007.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc535768ff---1121462320.pdfIn PDF document text
    • http://renknh.com/ckupload/files/57919131039.pdfIn PDF document text
    • https://ferropula.hr/files/gopapimegozisifux.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/49104119369.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/2743ce6c71218b39b4ab4fb458247859/32686832133.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607dab197a7e6---2498889078.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/negonowuvogaxamujad.pdfIn PDF document text
    • https://signika.pl/Upload/file/firabux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=download+roms+snes+apkPDF 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_off0000ee24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10636 16344 bytes
SHA-256: ba3a9bcc0fee0655ff7cec1444664d48e21cdef7b83267da2952850bfa5c2768
font_02_sfnt_off00013071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13071 10540 bytes
SHA-256: 4324c007f9bbf0be601325cdb39a67aed13ea3164a15b1e6bdef798ffc090da4

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