Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5ab964014adfa0…

MALICIOUS

PDF

84.6 KB Created: 2021-07-18 08:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ae6ea29c0a7a08647ed66532c1c63a13 SHA-1: 2ca96a34f62118d58703249797444ff42cded226 SHA-256: 8a5ab964014adfa006f0130d5caf05b051851d95dec63fa5de14f73aef3225d8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs, such as http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4c365ad1b---9881045724.pdf, are likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.alexgis.com/siteuploads/editorimg/file/divuwotadarilolizi.pdf In PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4c365ad1b---9881045724.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/5379078374.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973360d2181---mixenaruxaporokosijenimot.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2c8322dd5---xuzufofuwuxifuw.pdfIn PDF document text
    • http://arlingtonhigh1959.com/clients/863184/File/bilanaxikup.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d784f199eff---18849333974.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/68609367525.pdfIn PDF document text
    • http://jonmechina.com/ckupload/files/jozexulexowudur.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/denejoje.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/rarofuvuxovojijek.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/116c8b63869af79045f10cfcf89c5679/pujalureza.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/nen2839bg0qc2vhjsq4bedc6l6/nevovobidifoxosikeni.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/nuleduxojudorabex.pdfIn PDF document text
    • http://standdominica.org/files/files/kejekesizaperipetofu.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/m35alp6rmtm26v38fla9k688qq/tefababinobatafovo.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e8d391ed7---tosufilex.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/zasinosipilupogunatu.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/61742170693.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/edcc520555c2671ba4b7ba7ee98922bf/dibamizavojod.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160768fb780fcb---burokizagekibitumis.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/56831250649.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16084cc81dd561---gugatagunalodiw.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210707031215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=chest+tattoos+for+womenPDF 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_off0000e923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10135 17220 bytes
SHA-256: 7988828beced160a942aea37d732ea68e2bd5cb4e4f87f01b16e25622b805314
font_02_sfnt_off00012dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD0 10460 bytes
SHA-256: 7f741023aa50547e1d55e1fab478a6389fd03922b8fa47a8c701864dd132017f