Malicious PDF — malware analysis report

Static analysis result for SHA-256 d375c264fd8908be…

MALICIOUS

PDF

74.4 KB Created: 2021-09-28 13:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 88434337d49c2f352524455ee90bd9a2 SHA-1: d23eb88dc25b6303e886f090ab9c0d1f4c0d3877 SHA-256: d375c264fd8908be2f93c6a26ec3f1ac58378a8c697c44d9f99ec252712ffbe8
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised WordPress sites. These links likely serve to distribute further malicious content or phish for user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c95fdba5f4---53470991807.pdf In PDF document text
    • http://sjhtractor.com/d/files/2023307751.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/kidutobifi.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146aec5809a1---93633908616.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613831d31dd3b---posus.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9024ab616---76022927949.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/kodavejafutizevi.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/79120571236.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/ziruzajag.pdfIn PDF document text
    • https://kvizek.excore.hu/ckfinder/userfiles/files/gixajedek.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161475498e3ed8---dixileluliw.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/videfifewezip.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/61508086a3962.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/pevuduxiwisofekigareradog.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/vabolipijudiborudebakidod.pdfIn PDF document text
    • https://matrixx.lu/images/wapobafajev.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/retalele.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/52597813488.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614bd518d2d32---vaverifimimidewomemeripo.pdfIn PDF document text
    • https://maymac.info/userfiles/file/71670612396.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210903152053.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/ditutegalebimefopuvene.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/refatadugowo.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/60535454055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=live+screen+lock+for+androidPDF 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_off0000bce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE2 10488 bytes
SHA-256: c4bc525f84d6f360f27ea88489729f5fe761aa721efc1b0771b5edec45ade3f6
font_01_sfnt_off0000d4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D6 18068 bytes
SHA-256: 68cc070c5adcec31f8a0e31bdb3a00a3f77a4c6562bdaf4061a5148bc6395624
font_02_sfnt_off000103d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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