Malicious PDF — malware analysis report

Static analysis result for SHA-256 1110440acaaae74a…

MALICIOUS

PDF

117.6 KB Created: 2021-07-09 14:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 28f53f43a694a0b075c378451542585f SHA-1: c88abf641d8d70058656ee68dbdec5881f23c037 SHA-256: 1110440acaaae74a4e69809a99168c54b9083bf76bf6419d2069e325f7ab6bd0
204 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier. It contains a lure that instructs the user to copy and paste content into a command-line context, indicating an attempt to execute a second-stage payload. The document also hosts numerous links on compromised CMS upload storage, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0af6a7d507797317fab99a59897f6a97/66413821366.pdf In PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/4d2e5e53568ebed678bfbaeab3c4932a/41643067689.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/bajukeposudedadupepa.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf019cbc2fa---75876374963.pdfIn PDF document text
    • http://mytaylormadefamilyusa.com/clients/864113/File/82197485752.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/3493219725ce892ef96694a3684d0f2d/xikefadefad.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/sowilirunasokegos.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/nolijiw.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca733c922f---1768297248.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/3fab9d2562b2d7ca455ac5be003418bb/jivibukiratexaxipaz.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/jerowubidetodoliba.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/34490627712.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/hhe0hk2ldvc8nluat32pmpfnuv/82424820688.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/gunudelanosewababenuku.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/f07aa24d42b352b98f37ba6da56293e1/wetuva.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/kokasowo.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/fenifaxodugirulute.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/81179783791.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/ebef86789fb62e3d424d3636954ca983/mekifex.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607997a912645---14731655553.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/1261cbca487d35ae510011298eb6f0ab/vesuvofu.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/m77ocerujj939ckjeqfbg624p2/69493289945.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/52658625534.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8dc9c29d8---20620140860.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4335d6bb0---71210134831.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32d232e005---13481964980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=minecraft+free+download+chromebook+unblockedPDF 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_off000166e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166E4 18288 bytes
SHA-256: 3614724bf4c78d560e8cfaa215b2c21758be7c88516396d06aa232057ed74991
font_01_sfnt_off0001976e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1976E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001af85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF85 10984 bytes
SHA-256: 587cbe9bfc364343c4d9ed93ab1f7dd98240923524ec9f3570cd903388d0835a

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