Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ae4c8e5f1c6d63…

MALICIOUS

PDF

89.8 KB Created: 2021-07-05 04:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2dc5f1e68d76034e06747dad8f3b4f04 SHA-1: e8d80197c0eb15c6bfc4bad5f06edba3c2c6ffa6 SHA-256: c5ae4c8e5f1c6d63e427cb7d0cac611472d6e41bc8b649d25ac51a23f5661688
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by an ML classifier. It contains a link farm pointing to numerous PDF files hosted on compromised WordPress sites, suggesting a tactic to manipulate search engine results or distribute further malicious content. The presence of external URIs and link farms indicates an attempt to lure users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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 https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d43b0a0b2c58e19520a94aaf5b882f27/bazikavum.pdf In PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/e1ghug60k7sfpqk3poh9mjdmi5/72651144702.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e21635ead---kuxopijizigowe.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebd1849a03---kutididij.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b41be68d5c1---61199345659.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/l1uogcu53603spuhj2api2idq1/32863982697.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/39549820571.pdfIn PDF document text
    • http://www.toptehnik.si/images/zizaweb.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/gegisakoxafawa.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/5ck119qf25fb5km999io1820lm/surejilakujip.pdfIn PDF document text
    • http://cjatkinson.com/userimages/peviwisesopipobi.pdfIn PDF document text
    • http://lhsclassof77.com/clients/34792/File/14007485204.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/81823398158.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071b5a4effb8---57259717967.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/15126814647.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160761cbc41958---zeginu.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/39483c8567e1b61d9cf1b43d563d7c9c/96853388637.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/zedelidupaxaminutu.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/lilupejaratoparolu.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/84137062064.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/p2mun1uen63p22t23k5g5kk45m/tarusif.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/matilizijixeratisilewaxi.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1mmemqij6m2es01r8vtqhhtca6/86030896528.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/mafumezo.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d27da6ec7e---12360309172.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/basoxime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=a+foundation+course+in+human+values+and+professional+ethics+pdf+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_off0000f8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EF 11116 bytes
SHA-256: e3ff31ca109558cc718ee1915778e7fe1deaa5830afe750eca51fdb4d65e05ed
font_01_sfnt_off000112c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C5 17512 bytes
SHA-256: 4867d0defdb87620758224f58ad25ab80ed5e41ebdb4ce814d59be728985cd8e
font_02_sfnt_off000140c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1