Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0fd15c8334970bf…

MALICIOUS

PDF

83.9 KB Created: 2021-08-19 06:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 38c387b9c389dc282c5a69a5729b0ac4 SHA-1: a6299f371a60ad49dc071301a15c61b36a3cfa73 SHA-256: c0fd15c8334970bfeb754867db4ccacab5e8be7d61f08a6cd732c53f04437702
144 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which appear to be compromised or disposable hosting, suggesting a link farm or distribution point for malicious content. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a command-line context, a common technique for executing downloaded payloads. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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--o79av69abka850ab6c.com/upload/file/202107010042196892.pdf In PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/wopupixabojezipidebine.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8cf2753b69---fubavorozulu.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/48007463460.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/20644834413.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/141893602.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/lubusapiwap.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/d855fe61ee99a24946dafe11011814da/48521471843.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/kotavuruv.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/90600635154.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/susipogasilitekat.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/81394671339.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/mesukaturiraro.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad84231084---77392263231.pdfIn PDF document text
    • https://jagamimpi.com/contents//files/12345746164.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/s0a1t7ocp61234tpmcq8h9ib95/nezavemonabu.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160edb59da63be---vikumokazarofedetige.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/5755505460.pdfIn PDF document text
    • http://krzeptowski.pl/file/32546062499.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/sajuf.pdfIn PDF document text
    • https://cmoretv.com/userfiles/36078176472.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hfp0vmqdcbdh4nmdqd4l078hg4/36658994470.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/vunenezakiwujixunewoledox.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd44adaed5---43573433482.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c858ce750---lomutekupabuzetegunom.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/2af013643068280eb396dc456ced7dcc/89520951885.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=can+i+install+high+sierra+on+my+macPDF 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_off0000e184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE184 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99B 10820 bytes
SHA-256: 702afd12a4d17b21688dc527750c6c54e4df5a86c6f10616c28b1e1a181d1708
font_02_sfnt_off0001126c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126C 17212 bytes
SHA-256: f46e62041d98329da1218de9922edcd3c5f6253bf7409730935e3c13c77cbb79

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