Malicious PDF — malware analysis report

Static analysis result for SHA-256 738fa0bcb8bd690f…

MALICIOUS

PDF

128.9 KB Created: 2021-07-24 12:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ba3996493a554cd5629ce812f2c3e897 SHA-1: c88c3f850f8d978e1481e20e22cc37cc1e697a41 SHA-256: 738fa0bcb8bd690f7bf55b07d3b89e3f4abb91980cd0064c82a7cc38696f12e4
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 sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/5bff8a3d1b2a1d34afa5bed43fa80f30/lawevanakegabivanomude.pdf In PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ecdcb1de---74422833864.pdfIn PDF document text
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/ferutotatonuwupozivi.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/21810721086.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/kevavij.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092523593f34---60883223541.pdfIn PDF document text
    • http://allasclub.com/campannas/file/lurogelurovexo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607606618177e---zekixerigopabigafope.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7494181215e3e2dbe83466e059e4f078/rasirefosulobi.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/rozomaxiwasud.pdfIn PDF document text
    • http://dakmet.pl/upload/lalemuzerilemawirab.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/8188584921.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/rowifalinezusevagufolajer.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/kazeredaxudezoba.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/9dc745e6ca3b6be56cf1e4ea571cca98/17111799438.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/15360934103.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/85066069431.pdfIn PDF document text
    • http://skncn.com/u/files/kenuze.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606d23792cd1a---16197609947.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/rabizukulukimuzadegak.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/bukojowudirilevuwawewe.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160984bbf237fd---65116961869.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/a353ecb026075e23bdbb2e05a9ef1bac/fojigezu.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/dfbcda830f63eb8a1ba0e0e32eb2a72e/63299533599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=harry+potter+and+the+deathly+hallows+part+2+movie+plotPDF 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_off00018fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7FE 18728 bytes
SHA-256: 4fd5dd5cd11a9c0f374d2c03415b44284ce6ba9aae635b15aeaf45c3ccdba71d
font_02_sfnt_off0001d8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D8C2 11036 bytes
SHA-256: 68992bd99676be83a65139f025125605e3eb535ca4992f68a8e19c25fe88c976

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