Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a8d04225aefdde5…

MALICIOUS

PDF

74.2 KB Created: 2021-10-01 07:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: defdf08d4cbea65baa8a1c9f76f1b086 SHA-1: cb4f469d691fac0d3d1eb194b0b4b3bebad74420 SHA-256: 2a8d04225aefdde5387b8ac757553b715764abc58c9340b38e4ddd68d642775d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains embedded JavaScript and presents a link farm structure, with many URLs pointing to compromised WordPress sites or disposable hosting. The primary purpose appears to be directing users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 7

  • 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.
  • 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.
  • 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://wsm.hk/images/uploadfiles/file/74520026911.pdf In PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/2a5058f36ec6e632ca1853ec2b03bc40/41223329301.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/pejevoxe.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/gafomolamuzojutivujuw.pdfIn PDF document text
    • http://hiddengemsbookstore.com/userfiles/file/davuzages.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/20946453179.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/zoxasobogizakub.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/3cc8d5d71a2b688de42bcd07480906e8/xajafanijukawagulokun.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/28622805651.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/65134563025.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/zetigufetamori.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/13026264256.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sojamoxoweveritelalugob.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/juvulu.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/75538651843.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/58080937622.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/rudemuduxiwowuxeroxesuzow.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/katoki.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/pagepikikixabuwuwesega.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/95455851306.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/63427604565.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/028bssnjbm2ahb97nbabgiup3l/30175933847.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/30519527819.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/miweb.pdfIn PDF document text
    • https://eravikulamnationalpark.org/ckfinder/userfiles/files/jiwapalivenuw.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/92920369499.pdfIn PDF document text
    • https://musluogluotomotiv.com/upload/ckfinder/files/mupikatad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=toy+story+2+androidPDF 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_off0000bc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4F 17960 bytes
SHA-256: ff5931a0a7ff0c7388c19bcfc03977079041a1561f74416364bfb9d293b94df9
font_01_sfnt_off0000ea64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001027b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027B 10260 bytes
SHA-256: 2742def0472e22011bedcf9109cc0d5afae4b0030718e7a58275346309d5d283