Malicious PDF — malware analysis report

Static analysis result for SHA-256 d34b0fe088329e90…

MALICIOUS

PDF

82.1 KB Created: 2021-09-07 19:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 20fb152504a84caac89f7df86b2f6ea1 SHA-1: a6aad4ffa004e8f81771aacff67dd1e0d4af4f07 SHA-256: d34b0fe088329e90183475ab3b08c2d51c4316c7200b36426b0981b362a2ec40
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of these links and the detection results indicate a high likelihood of this document being used to distribute malware or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://harshahometutors.com/uniformkontakt/userfiles/image/files/93900118112.pdf In PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b43c52ece6e---74376441283.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c641486816e---nolawevukege.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/ritapojifudumo.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ad82b922b---59879004626.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/jefadanunojirikesutoguze.pdfIn PDF document text
    • https://huanghecables.com/d/files/92009202406.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094539296a1f---2500942373.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/98d761f090812ed8e78e3d562401fb14/43896920777.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/43743620256.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/napisaguki.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/rvc996i3fak3c8vnts7guuispr/36025510630.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/ratajerijen.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/i7q9jf2kja9ccnbqe4flii7sf2/27513967247.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/86140631809.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/wuvon.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/dj8006s8gtrugphk8rloudfck0/letenirovudikajizakola.pdfIn PDF document text
    • https://samudra99.com/contents//files/bigigevomogefepol.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/moxobixapoborexoxoj.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/nowilirorale.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/31369374190.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/fafujobapi.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ece244ba4---zijerewo.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/bukopukalijikeboxuzir.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab31bafad1---redujazazavefuwonenifelul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=workshop+agenda+pdfPDF 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_off0000df0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 10624 bytes
SHA-256: c45590d1ed9472001e6e754907173dba294d366fe45c44bb5426f589ac5ec9ed
font_02_sfnt_off00010f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F30 16856 bytes
SHA-256: 4189cbf3265f266edf72398e68738d797d742c179004ff3004c2143f4c640928