Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37eb1547b4ff531…

MALICIOUS

PDF

85.7 KB Created: 2021-07-01 23:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 57f45a6d9f127b09c2551a6160194a53 SHA-1: c6a146397640183db7c150adab99addfdf819031 SHA-256: b37eb1547b4ff5315997bf193e0401128885d03a080c35e12fd6df8f0353479b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload storage, characteristic of a link farm used for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://binarbaidfabrication.com/public_html/userfiles/file/40205786224.pdf In PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/v01gg3fln1acvhaohprmgld4bg/kazupabokogeri.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/wixaxeberibowumine.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/58898962001.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/41077260478.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/josidupanuvivazodetuxuzor.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/889b854041a6aac7576636b682ea3155/32520915073.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/zemutufekasejakuniwamited.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/ba280b160e0f11ef9c48714d93f1525a/70171756280.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa2aac5aa4---zawaxakatozibajoniwil.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/gob4svb50rp1tj3h7gpa1kme90/tajotusuparunogefiwizidu.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/rugeruwikasolusoz.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/22258051035.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/zeranoxowelesodaj.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16071691638fde---31295217513.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608baa793f661---nufazi.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/60752155592.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4551f97cd31af1b24e1a99d5eafafcda/dexem.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/2pu0um8ak04lvtdkgvu59kql85/datidujipixiwiwemomuxim.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a7d48b740---83815467361.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/27026326599.pdfIn PDF document text
    • http://garderoba.sk/images/_file/44038779509.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951cd554e6b---joxavunakevevidoke.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080e6c9c2c42---desuwumamudo.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/3qd40jcmfc54sgpvtlv8ugrs20/fonufomijogefuzovodamup.pdfIn PDF document text
    • http://kotolantopeni.cz/file/ziwabijikimagebavupite.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/528d89a71bb90039d77de91e4289023a/xazulodotazifujaxevixoro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=physics+by+halliday+resnick+and+krane+volume+2+pdfPDF 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_off0000e750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE750 11420 bytes
SHA-256: a611f318229cd0030da5c5fd0c034eb83f822bb4e6198feac4a59f58623d7b45
font_01_sfnt_off000101e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E7 18940 bytes
SHA-256: a7bde2ed528cdda7dd2a108cc92fa0385d40b4f911a78e1d397897bd91cb1558
font_02_sfnt_off00013101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13101 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1