Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e7b893f7b00552c…

MALICIOUS

PDF

71.0 KB Created: 2021-09-15 06:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d24500dd46474d7ea04a6b8d6d031ec7 SHA-1: f5132db15e00ad5a7cd60a3cbeb3269ac81f857d SHA-256: 7e7b893f7b00552c5c95ce8e5d579392bf825d16efe720acfa6ec67474d2bfc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://pistant.ru/uplcv?utm_term=recorder+call+pro+apk PDF link annotation
    • http://pfmconsulting.org/survey/userfiles/files/vovozinafi.pdfIn PDF document text
    • https://webmenuplus.com/images/file/xibuk.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/98687513081.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/ragovasekajoxe.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/20879944598.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/75376066113.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/guzedigodumun.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/solidebusutagukefurukusi.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411bb2c86fc---fujemelodogiw.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/2a5058f36ec6e632ca1853ec2b03bc40/41223329301.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/nelowivotuxikajawozizof.pdfIn PDF document text
    • http://hangquangauto.com/files/51968994097.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141196f45ae7---1222777666.pdfIn PDF document text
    • http://thegioioto.store/upload/files/55528329683.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/72954625128.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/jogetikakosop.pdfIn PDF document text
    • http://fpole.ru/sadm_files/pavunezalufesuj.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/sirerit.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/8c0ab2cd09a335309e3b377035c1abd5/gadilalixedufu.pdfIn PDF document text
    • http://poorclarescork.ie/images/vibemiporasokapog.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/zagusudimumodutumutiral.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/vozitopa.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/88899579079.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/759a0821ad8e73c2d8c7bbd3b602affc/45294059355.pdfIn PDF document text
    • 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_off0000b473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB473 10184 bytes
SHA-256: 6ab97aa79aeff480126afa3039089cdb630d63dd2fc2e53ae01d289140925131
font_01_sfnt_off0000cb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE367 16952 bytes
SHA-256: c9fdc4a43e497dc0ea5196600b9eb156385ff287be8e105bf6d80453814c308a

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