Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b623e8ec02be38e…

MALICIOUS

PDF

87.7 KB Created: 2021-06-28 08:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4fd1eba54d79856f7e8c397d1584f06d SHA-1: 77f1819884cb672928572ed606dee82189b2f4c6 SHA-256: 1b623e8ec02be38e58e31683495639e6cb98d844f55a53e80cb3dc56abfebbf8
236 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of phishing and social engineering. Heuristics indicate it functions as a link farm, potentially leading to compromised WordPress uploads and disposable hosting, and specifically lures users into installing browser extensions or updates. While no scripts were directly extracted, the overall pattern suggests a downloader or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://lederstuhlshop.de/ckfinder/userfiles/files/wekosa.pdf In PDF document text
    • http://donauwell.at/userfiles/file/bofajuf.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/12303138408.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a7deb8f1c67---pewawosoribuvifu.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607f1fb69b3f5---boxunamijixegikajofobiko.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f73f9b7bf6---jufobojubus.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/xirolonasivanusoji.pdfIn PDF document text
    • https://migger.dk/userimages/file/15933059223.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d924b75fc64---kotelel.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/39299936747.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/mixipikaxitajejamukuw.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/70332222383.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ba9a0f7fd---nutabezoredoso.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160986174618ff---novezejukarewulunagise.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22e123682d---gepubilosewomopitupajip.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/4e9b4b8bac026afa3624f1e4624b1d24/winiz.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/ld18rsqkj14tt1fkk01jueb5rh/89690017639.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b05d9bb6cf3---11765001338.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/80859643538.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/xufigigegofigimodot.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/37529513504.pdfIn PDF document text
    • http://learningkey.org/userfiles/lujivagevareku.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16084390087ad3---lazivivuk.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087ae1dcb7da---10481202432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=unprotect+pdf+file+without+passwordPDF 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_off0000f2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B4 10908 bytes
SHA-256: 03332a51417a3dd161ba0ef9093926c7a040c6fe19980fbd8d44aa8c8431e487
font_01_sfnt_off00010bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12402 17384 bytes
SHA-256: dd5de8377c18b6bacc3cbd82b46fd73f6d28684a8ea9e8c4480de62c4fb44f6f

Open this report in the interactive analyzer, or submit your own file for analysis.