Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c780f7f5d9ee14d…

MALICIOUS

PDF

99.9 KB Created: 2021-06-27 07:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e8af70c78f0c272472db70a2a365bbe4 SHA-1: 1aa6aa6118d4c25f650e43354febd53131abb9b7 SHA-256: 3c780f7f5d9ee14d5a55550942b741fd3ee54af9f382cb9c031164fdc1c026da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly suggest malicious intent. The file's structure and the nature of the URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/194jddpm2brm7hqgmdorrivmi0/72702266272.pdf In PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a65764a3fe8---kimawabas.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93f791b5f0---rizuzowodavupuxobadufod.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/1821053769.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f361d389fc---xujulog.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a295c092c---17594311678.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fed72f11d---murumibugoruxit.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e085043080---8314643077.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/e9f8a56e40b04290884cd2fc537cf7a1/82666069608.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/60940210673.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/76223272270.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43606d7a5d---lafikumanaxetoposom.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/85964223136.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/17902104985.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16071a24879b55---83670143089.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/wunurososedavanizozonaje.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/d4ab58b0185a87e7ae17c5ab2b4e3fae/63738300049.pdfIn PDF document text
    • https://agatanorek.com/files/file/87266473202.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/wunubetilanegixaweje.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210605_088CA2FD8122350E.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/57814122261.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160869676981d6---rakoj.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/datisoreko.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd51c448534---totefidagevafisesewo.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4e55d5e2995ffa39d67e559029213aa1/jomejiz.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c52b395bc---65122349499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=it+is+primary+education+that+established+foundations+in+sciencePDF 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_off00011ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF5 11188 bytes
SHA-256: 979965afe2d6b642935b712eaf291f35633cdbdb253d12724bb63c7743962dd1
font_01_sfnt_off000139b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B6 18904 bytes
SHA-256: 2d1cb01833ba88fe3632c0d0cb1099ccefc9028b9cf4c41ecd12ee6c4d42f1b2
font_02_sfnt_off00016995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1