Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b4885f2455e414…

MALICIOUS

PDF

89.1 KB Created: 2021-07-31 16:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 892ff6015750a34b00601d0823c3c7ac SHA-1: 9ad9347e48e3a37d68c4bb05d854f10cac7abcc9 SHA-256: 01b4885f2455e4147c0ae24599e7dbb0773cb2e85b4dbb378dee5d756e89fd79
196 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a 'Clipboard command execution lure' heuristic, indicating it instructs users to copy and paste content into a shell. This suggests an attempt to trick the user into running malicious commands, likely to download and execute a secondary payload. The presence of numerous URLs, some pointing to compromised CMS uploads, further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://raffaelecavazzoni.com/userfiles/files/27025423527.pdf In PDF document text
    • https://bczenekar.hu/files/file/10681124047.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa65a169d36---vunasadirimatifub.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/nowekufutal.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/67739114820.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210717_033316.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/54349026261.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/22413739645.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083d6de343e6---mobegimoxonazevatomosudu.pdfIn PDF document text
    • http://aven.su/userfiles/file/94044064764.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/79285574582.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/3216651021.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/32728809352.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a0f4a8e42e3b8a2f3a417920631707e8/36036375993.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/purefoxolomavasonubugefez.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/f1cbb6e4c48a8119c8b98fdfab2ec53e/fevozuzubal.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/20875579929.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/27992466407.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/d17264165ba55f656933f1bc839eeced/fomajifupuwosatad.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ac37413a2a3e5f6e40ed00c1d42c0c99/49490747530.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/b90ec1333ce367c885e68240f3a3439f/bagojagegarifipo.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/sunojosudutupamesavazerel.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/tazivufilevokegevos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+factory+reset+from+command+promptPDF 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_off0000f75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6D 17240 bytes
SHA-256: 38a38a11a8e9657c294d29b2a6245bd8444445389da638204c4ef3c351032558
font_02_sfnt_off00013cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD7 10832 bytes
SHA-256: 9ec854174ca073e156013d0359212b5f1a70a5424dfc6f4bc724ebda699d1688

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