Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55fd517280a40c9…

MALICIOUS

PDF

118.5 KB Created: 2021-07-21 05:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0e4d7c3eb6a48107f17c5112158df640 SHA-1: d1e64c3d670a7c1c4d471f387648487ee5a42fe6 SHA-256: e55fd517280a40c93b029f04de8f70ca7ca1eb749abcfd27c3493b83dca011e2
196 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. A critical heuristic indicates a 'Clipboard command execution lure,' suggesting the document instructs users to copy and paste commands into a shell. This points towards an attempt to trick users into executing arbitrary code, likely to download and run a second-stage payload. The presence of numerous links to compromised WordPress sites further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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 https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b531acf251---6660141214.pdf In PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/hid7coatoj7td8nt3me4i2ijso/13247212846.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/gerolojaxigedo.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/jexanojifo.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f4ea08bcd78---43472083939.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/gasubomezasivonalegogijus.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a035c219a---tavunofidodo.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/88374458524.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/blqmj1755mm285bn5hg4ln1f00/fusutive.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/eb02d94253f9efffd7e8bcd2b500cb47/vilidumosagexu.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47b60a6402---83295825468.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d9d47751a---xiduraguga.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac11840d64a---8162245547.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/29884062b34a2b7c8edcb3e1981a6331/74126669662.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/90519069805.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f1bcf296f54---kubav.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/molekumagiponadosajejoz.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607858723e790---46751176909.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/67a2fbb117413c36d94fe68c40306a9c/gunonatuzes.pdfIn PDF document text
    • http://sartor.ru/upload/files/niriwimamurovoxitapovav.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/190954ed177d56c8692a6cc550d55068/difafewixotosul.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/juludobeserufurufa.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/67023881949.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/6a0ilsdute04reiejlfatttjc0/20929868266.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/ferobe1620590740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=learn+command+line+and+batch+script+fast+pdfPDF 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_off000168fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168FD 18952 bytes
SHA-256: 7a757b22a340f9af29893920fdbc8a3dcd34120981e6e7c6e9c3f4f26b54be12
font_01_sfnt_off00019b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B84 10980 bytes
SHA-256: 59a1b7ff2d0220ce73e04dec07677ae56e034ab6e41759db07395db21142fb28
font_02_sfnt_off0001b489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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