Malicious PDF — malware analysis report

Static analysis result for SHA-256 c618520998af1e34…

MALICIOUS

PDF

89.8 KB Created: 2021-07-19 08:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1cedff548091cbddc9dcf36eecd376b0 SHA-1: 8c6fb22060181703e2d085a3c8cc380fee9d84c3 SHA-256: c618520998af1e3442ef4bfab274d77787f3bfd30c0d13b211b1d4fe9c60fd11
176 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains a link farm pointing to numerous domains, many of which appear to be disposable or compromised, suggesting a phishing or malware distribution attempt. The presence of a callback lure heuristic further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/40718577011.pdf In PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/2bpljkh00akrfue9b8nvtf9p95/58395953398.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/sfmalp875j7e0ctkpr6t03s8ut/puxugere.pdfIn PDF document text
    • https://aaaxxion.info/images/file/2084642326.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/af74ccf951f31c583fb8ae744e7b9ba6/pukapidufikom.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/2a4627d38e494ea6e377a9d49045d378/75533870402.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a3b90c76090f6c508b97a5caf15c8a28/zaruxokigukidewubero.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/visovirerofa.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/tegozejine.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/713eaf58c7c8f7058bf7bca86a7d6f0a/60075267499.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/gikazod.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/fimopanafiwemozuvodanopu.pdfIn PDF document text
    • http://dahchen.tw/userfiles/files/12012421745.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/105caebb67cfe59b738d7f707c6057d1/62085155810.pdfIn PDF document text
    • https://triosms.com/userfiles/file/2140008808.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/41b9fdf1c5ad8a069efa0f7109993d26/40938897090.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ca7b618dd---veguzajulo.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///popovi.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/f6cec9520732db730cacb47cce01d044/renitupudajewerolexa.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/52805727022.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/9e70dcfd6a432cbd2c24c065f0ccc630/monexanufiteda.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/46801009327.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c31bcb17a2---50768619225.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/0c97b078575a39f5667fc601298a9014/pokor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=1+toman+to+inrPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FF 16564 bytes
SHA-256: ea196a15fb4d880b31d23c02821f6afd601f3c48d9deb7f8762dae372c82096d
font_01_sfnt_off0000fb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11365 9880 bytes
SHA-256: d340f5245330ccb72e73d1aa1b1baa925cab70fe54fd286c3bd1996941c4c725
font_03_sfnt_off0001290e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290E 18700 bytes
SHA-256: abf3656d99de36c7d6f09c27ed44b40f0ae7a8513eb5f82717edde8126970519

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