Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbcd9fcf8602618f…

MALICIOUS

PDF

86.0 KB Created: 2021-07-13 19:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f9767ecbf0d672df98f96ac01ca366aa SHA-1: 4b05e3ad2b39a213d886c172154716ff939e43f2 SHA-256: cbcd9fcf8602618fa0a6aefd8d010f41b2020fe815af12a50d6c7811852012ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of links, many hosted on compromised WordPress sites, suggesting it functions as a link farm. The presence of URLs with 'utm_term=download+any+video+file+from+any+site' indicates a lure to download potentially malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=download+any+video+file+from+any+site PDF link annotation
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/d07f31e5d958d4477f39561c3a501b99/5125368630.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/rovikaxigitiwawejeso.pdfIn PDF document text
    • http://praguetransfer.com/files/file/24230775134.pdfIn PDF document text
    • http://donghotam.com/luutru/files/wividuverevazowusorati.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/bupafisirexomiguxazi.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/0f1859adbd5d5e7d2e1a865e9760a484/4138380085.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/fgrdmlbis30g4sdoeqhab2n5jr/mopaforalenomesokal.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/fsjiblb0gonuvvs34u9ubuelv2/sokenevisigixen.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/10481241128.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/vezasalisejup.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160804a1a8ec53---25297569976.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984b2c41096---2211587112.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/62632956474.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/36673346784.pdfIn PDF document text
    • http://alltechsro.cz/files/11397091103.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac38fd2c080---37256208551.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/r1b93kke8ino3uodjsui2h87so/lukapir.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/tazaxo.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/48945558247.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/rijovifenajidojakisijifas.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/5379c37fea1f049506cd0122badc0628/54128385440.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/cde698c84b312f7bd64282586c0adc05/22415693481.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_off0000ecb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB1 17168 bytes
SHA-256: 9a50f485d0891cea77cec8ce5a2e8548b894516cb0dab0e92a699348014cb328
font_01_sfnt_off000119aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AA 10784 bytes
SHA-256: 2ddc7ad06859e1141a590e14bab93e8983bb84bfd48f1267357efe88468fce06
font_02_sfnt_off0001328d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1