Malicious PDF — malware analysis report

Static analysis result for SHA-256 3447e6bedad687d0…

MALICIOUS

PDF

96.6 KB Created: 2021-09-08 06:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1e4de381a52cefd658bde4a31e69fbd2 SHA-1: 3cde1b611abc7fa06701c360316b669c9a061e90 SHA-256: 3447e6bedad687d06dcc5f46bf14982aead45f253e526cf3c3a53d7ce56c447e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lure users to phishing pages or download further malware. The presence of multiple external URIs and link farm indicators strongly suggests a malicious distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bvtnmu4t9h7iaie6ja8rtn5sk3/10455236818.pdf In PDF document text
    • https://hobbes-group.com/upload/files/28666003323.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/sojuduk.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/767227972.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759afac7757---30525196927.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/62417446330.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/97310384760.pdfIn PDF document text
    • https://tdfstore.it/file/24035183803.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/12222373707.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8dc9a4ef7---telof.pdfIn PDF document text
    • http://strandedtattoo.net/file/bekuxixuxuramexaxeguta.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/8635172972.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/7o2qkmasaidc1n9uv1k6r8pin1/vanek.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/avhdbftq97efks86fdta8trpuu/kujugawo.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/mrna4hqiog6oas0qd10ig57bis/19879299622.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/45769992728.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/9272de86a81c3299306380b661ffac0f/32683385852.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/19879397377.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/97912376806.pdfIn PDF document text
    • http://briarcliff70.com/clients/874901/File/pijeta.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/3e9d741ff049aac9e27e1c8a7d1355c0/5064118229.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/aed2a8f10a6d98ecba4f83d1a54b455d/29788639210.pdfIn PDF document text
    • http://budka39.ru/files/63055195399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=welding+consumables+handbook+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_off00011537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11537 11196 bytes
SHA-256: 231a25892f2d1b96e20c08bda3925190780fb42fb3e5412ff99a66cb574a807e
font_01_sfnt_off00012ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBB 17948 bytes
SHA-256: a1f75c33546937966afebb89027e433a1b23d797b34e1defd496ea06a7a17bcc
font_02_sfnt_off00015ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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