Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d5e7f35e3c517d6…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 16:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 13d0a916ebace42f50c4c72f033f21ea SHA-1: a91037cb40e3158bab7042c047b4272f6c2856c4 SHA-256: 7d5e7f35e3c517d6c35a729c18bbd98a28859f2fb560df0d399c82e7d875cc47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as a phishing trojan and ML classifier indicated high maliciousness. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malware. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://www.uflo.edu.ar/ckfinder/archivos/documentos/45639394300.pdf In PDF document text
    • https://10s317.com/uploads/files/202109020051317396.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/rizisugejobaxilaji.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/55a5ff7598b1bd84ae882ac40706e765/97086181163.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/37199402874.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ab180175764ebecf3c611cbe9cd876b0/42425453978.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/musigokuziluwalolazimame.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/99294864488.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091602534738.pdfIn PDF document text
    • http://e-sheremet.com/img/falavokususirepafobepinak.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613b71ab2dca9---rizisobo.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1e73b4d9f---saduribatorab.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/57802551684.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/56073525178.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/1068483676.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/lujox.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/vodosamefuwifawitimawef.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/29456060741.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/zovewenorega.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/8e712f23d5212ecf0feddec4e8f8d42e/xizoroxibisuvogulitaja.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/24120595948.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/19465078099.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/41265718304.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/bijimubol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=sargam+app+download+apkPDF 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_off0000cdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB7 10500 bytes
SHA-256: 160fe4236088c4a28184aea2081a41f565d6fc65fa17724f587b0bcf9bf71d47
font_01_sfnt_off0000e55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55B 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off0000ed53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 21052 bytes
SHA-256: 001a2cc966e381efc344df94b231a5404ded46f7f084535989f550a89eae8839
font_03_sfnt_off000123a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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