Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25c21b73a5da6f3…

MALICIOUS

PDF

78.1 KB Created: 2021-08-30 02:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: da693ed2db2c69bdd4982c6b78ac556c SHA-1: 98d5a128ec609e59192a8df7152b31a2d59dbd37 SHA-256: a25c21b73a5da6f3f985192cca9c951b5e0d21374301b38c01e0ce3e9904b832
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://huntic.ru/uplcv?utm_term=a+concise+introduction+to+logic+7th+edition+answer+key+pdf PDF link annotation
    • https://myphi.biz/nbloom/fckuploads/file/86446522283.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16112a1965d0fc---8489289105.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85e349f0e1---momezuru.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/bejejujewerokepulex.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/e7f957706163dbb1c9085cb2858567b5/18363565021.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/72102968316.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2b9829f325e4599e1a5ba4ca8192c17f/51266129140.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1606cc46d5d0b8---14856373930.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/degurifonulukipolivuli.pdfIn PDF document text
    • https://migger.dk/userimages/file/62381795842.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/924f5ba3097a686999f195af9a0160d0/9513352473.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/waluweko.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/nigupilaxeful.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/75803792496.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/c5d5a835992892359a368a645c526c9c/kubuju.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/2436f61317b5a8bce8ecc5b3275a5e10/39496441264.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943a284ba4c---petolomamapuxonitil.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210804055649.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/3bf73tqmktanougf7hbkdio0b5/voxamaxuwu.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/72279278890.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e67af93a51---57022358223.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/woxugazepoweronod.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/20073556815.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/oecrj4j1ibp9lv6nffgcl6tr0m/54450323066.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_off0000c759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC759 11320 bytes
SHA-256: 8093dc4335a4de832b0a73f59f608f20a700440c9ce4740bc86cde2c40f75879
font_01_sfnt_off0000e1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 17564 bytes
SHA-256: b3169769766f991008eac320a7ebb8c5058bf6c432bb46d3a4fc8c27cb4fa17f

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