Malicious PDF — malware analysis report

Static analysis result for SHA-256 9053a94a1c30303b…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 02:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 04daf3b6a48d8bb5370925f1596cfba3 SHA-1: 7b59b9bc9fe3d0ce1daa8ab46a4bede565ea65a1 SHA-256: 9053a94a1c30303ba816dab3746f7741b3c1b364ee0b65398065d7f97a39c680
196 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains heuristics indicating it's a link farm and a lure for clipboard command execution, suggesting an attempt to trick the user into running malicious commands. While no scripts were directly extracted, the nature of the heuristics points towards a downloader or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ajisushionline.com/uploads/files/41585567917.pdf In PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/jevisi.pdfIn PDF document text
    • http://myatkinsonfamily.com/userimages/kijasotagefojedelamudul.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/wuwamimoteni.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/wunuxilulemigo.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/kenasojizeta.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/5c888b4e88b270a7fdcfb72aba346a39/peveg.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/58655894880.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/35285770611.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/zaxoseketovan.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ms64jripakdust6f8lltfhevp2/46191713068.pdfIn PDF document text
    • https://n-tlg.com/files/file/fosawupajozemawubunesod.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210901060308.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/pimivon.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/fadusowatewigigiwefatiwuz.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/aaeb42026e8fe71699cb4331bf6b1373/60849194370.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cf2696802---1514553670.pdfIn PDF document text
    • https://curvy.tw/upload/files/pukixisebunideg.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/02f7a5dac2bd2dd31cfa65161059a3a2/nebub.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/75739330757.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/17901963417.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/lojogiroso.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/baboxuzi.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/16274717924.pdfIn PDF document text
    • http://konberdbio.com/upload/files/tasofufarojigemizune.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/38405661754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=xplore+full+apkPDF 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_off0000e2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF5 10088 bytes
SHA-256: 9a46dfe97a403ecc0093791d75e111e43f4b9652ba9b75fcc3c57d002e6a680e
font_02_sfnt_off00011190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11190 18680 bytes
SHA-256: 8de685b9ec4407b302f2a3982862b045290b1728c14be3f457d8f76b3c184b3b

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