Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43040fe491d2893…

MALICIOUS

PDF

78.5 KB Created: 2021-09-16 22:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1e2c169d2cd56da386e7ff65ab471ab4 SHA-1: 645b66015f8461484ba08c671c7f0f2e7544c9b3 SHA-256: f43040fe491d2893c1b36736d6734ebb29db124726c9c1b67cada48ead14272a
172 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://epoch-making.jp/js/upload/files/xosegadiwenozumotimevixe.pdf In PDF document text
    • https://gsm.company/ckfinder/userfiles/files/duxugenoguxowululojoriled.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161416295926df---zeratos.pdfIn PDF document text
    • http://wamer.org/userfiles/file/7862063091.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/95652154484.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/tidubir.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/nitepexij.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/99268685188.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/87397281708.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///70328295109.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ae600ce74---80673153641.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/161404e7836a85---19006069699.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/wuratoninipome.pdfIn PDF document text
    • http://acril.ru/ufiles/files/kapivozalekizi.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/walotoxugobejanedi.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614028b2dcaa3---98341247330.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/leritupe.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/oo51aaq5bp64q7vs231g1rnvg7/84404988786.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/7012972659.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/9635415713.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/e6b956ab446514c7f6a4bc3c21bc9534/pexiku.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/22171222654.pdfIn PDF document text
    • https://telorgabus.com/contents/files/90224841519.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/katubazaredubazobuzaj.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109101825094526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=bewafa+tera+masoom+chehra+mp3+downloadPDF 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_off0000c6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ded7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED7 11104 bytes
SHA-256: 0192e0e0b950592a497bfbeb910c57180b502be02ee3f396b0c3e4cb40facb26
font_02_sfnt_off0000f8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AC 19356 bytes
SHA-256: ef423166ffbf124f1d42cd9c8ded6076509b7c7ccd050646233ad62a4b75fde2

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