Malicious PDF — malware analysis report

Static analysis result for SHA-256 865024677b1231a8…

MALICIOUS

PDF

90.1 KB Created: 2021-07-25 00:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b599cde46f5876c83c66a09e980288a3 SHA-1: d37010080863a7397e312609925f428a5be8662b SHA-256: 865024677b1231a82b7f842b28ca3e7679ff2075fde0e254b9b5de92d4225b2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to host malicious files or redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086c7e5ccd58---57857145204.pdf In PDF document text
    • http://learnazia.com/fck/imagesfile/sopiwos.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/97m517d6mu7tdcgt17bin55cnl/5318763612.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/23vtitcmb1cvvm94s538eg6a93/kigifuduwijakoki.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/bf07027323946e0e0a665783146c79e7/90164430439.pdfIn PDF document text
    • http://charivne.info/images/file/29045825657.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5620311daf---54015345922.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82041398688.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/biluj.pdfIn PDF document text
    • http://humanlitech.com/files/files/16164806113.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096af782f7fc---25575505467.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/gexev.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/sfi7smv9fhg4itujqjk2f08040/lufafekizigimig.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/91474065485.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/87087f6c0a83a4029a46e0c8fc6246ff/41505458733.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/d3f768793c53802ea0b0b82a41dabf3d/jalegememoneviko.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/xugabobade.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/remiri.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/49571952752.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/4011246105.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d9222f2b4---defuvov.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/3505d3b5295de505d005d4531407d37e/13290258520.pdfIn PDF document text
    • https://777mto.com/contents//files/runivugenakugekugabizivad.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/307c803f300b750e4d216ee86526cf37/lukafipakap.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fca7b6c4d3---48317122053.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/24def34ebb9a0074a63f455b9643c7f7/64300263335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=is+voicemod+a+virusPDF 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_off0000fc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0F 10400 bytes
SHA-256: 0078fd6386e2fa17e5eff2b5215ad0aeaba2727d3acb2c0923bf43a0de35b264
font_01_sfnt_off000113ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBD 17252 bytes
SHA-256: 4bf38725e35649e1ec59b1d9fc9ad2a7df02b5d9bda4c6aa87fe791a7c4b9cc9

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