Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fdff226a4adab74…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 21:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6d3aae042ff76ce100c1f59f5afb1dcb SHA-1: 91c162ddf989ac250a52edcbf95737a91dd06743 SHA-256: 1fdff226a4adab7434fe559364ca78e2b762d51da6d8359f92068f6131849856
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting it functions as a link farm. The primary goal appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://daltan.hu/userfiles/file/18132810752.pdf In PDF document text
    • https://triosms.com/userfiles/file/simotigibapuvujovana.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/5lmsgjar95gppfit1837k2gbk1/zevemasikuguxifudajar.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68f49fcce---925660954.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/cb1ca82a8430e1424f78cdb9873ac9d9/35528375634.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/e0fe726cdad05c2d4555eb37e430627e/zanuni.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607625e7e42bf---pusagevosozawuf.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58ea252296---xizawudetugujubivixuroma.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c983f6997d1---83122705094.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/kudesi.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/2204403924.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826e65ce736---wuberujexivuwajukadaf.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/21ttudlbbtbpktbdtupn6m2nm7/funubozoferunomo.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2aa7d06efc3cf2ee0211a018006d61e5/bazuse.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/witixik.pdfIn PDF document text
    • http://oris-am.com/editor_up/lizabunusukofame.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/wutew.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/33988528353.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607073427f266---73975060787.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/gezepalusinizebez.pdfIn PDF document text
    • https://mimpidia.com/contents//files/firapivowiwam.pdfIn PDF document text
    • https://papiratisk.cz/soubory/13240027035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=lippincott+farmakoloji+t%C3%BCrk%C3%A7e+pdf+indirPDF 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_off0000d75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75D 18680 bytes
SHA-256: ffbb3f1ec7d206d89b4c2016d441a5cac82cebce77166f7419474937a350413c
font_01_sfnt_off00010464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10464 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7B 11184 bytes
SHA-256: dc061643779970ceec668b946e4ebf7db536c380ea01aaf2bea00fd4b7b6de87

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