Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b2392741e5eef9e…

MALICIOUS

PDF

85.5 KB Created: 2021-09-09 16:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f60741a028dd78ccecd2076371d155be SHA-1: 38b30b5685b256bb8832605990d134b0a8611fef SHA-256: 2b2392741e5eef9e226a56676afb5c7496fb3dc6ba8cce635a8535444455f209
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The file's origin as wkhtmltopdf suggests it was programmatically generated, further supporting its role as a tool for distributing malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=best+dog+translator+app+for+android PDF link annotation
    • http://altinay-law.com/images/file/25958499942.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/7711871241.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/96332835703.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/89871571794.pdfIn PDF document text
    • https://longhoang.vn/upload/files/80709686835.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/libexutovifobed.pdfIn PDF document text
    • http://momsystem.ru/public/file/89706485489.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/72341775930.pdfIn PDF document text
    • http://nanopena.cz/upload/file/50356680618.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16130f9f98c129---71268572910.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/ruvewowep.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/wizupabudelusavepeje.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/lesuzumenisafiko.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/didugox.pdfIn PDF document text
    • https://bursac.net/userfiles/file/17435891810.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/forevotovupesurusidu.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/g1kq3vgcjsqdnp259tmcfhl1d3/ragofure.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/c2cb5f5f495e4fb4b835fe85bd009518/ruzuxegozi.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/58060314988.pdfIn PDF document text
    • https://forumsevens.com/images/file/693973155.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109010927343258.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/ab89a0a668ff3f83db61e3dc6eac787a/pevijazopeganor.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/70e8691664bc258ab4598b1386dfebeb/pirovabuvifafo.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_off0000eb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001038c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038C 17244 bytes
SHA-256: 3c89420126de9a33f75c9d4f15735d9775bbf4b1bdeb80873f093cd8ca14b02e
font_02_sfnt_off00012fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC2 10728 bytes
SHA-256: bec3f394d238f7b748380e6232fdb6436b97cc4353c0e0f35fadcf5fdd2cced3

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