Malicious PDF — malware analysis report

Static analysis result for SHA-256 407a3627b9a89f9f…

MALICIOUS

PDF

76.6 KB Created: 2021-09-07 08:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6e2d05d9e69cf1c962f6a85e6cce446d SHA-1: 5f7c1e64a928e61ae03e20f166af9df8324d7053 SHA-256: 407a3627b9a89f9fa30a909dda550e3ca71ad74f21a2971c35d232bceb7c9848
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, pointing to multiple compromised websites and disposable hosting, suggesting an attempt to distribute malware or phish users. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/vpj37np35ss474gu8nb2kgkkfq/pevizuwiveninatasidilanuz.pdf In PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4389addca0---gumomuxero.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c89e6a82e7e---91715261976.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/25023338207.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a85a8af06---kikagebokakanalixivanapo.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/jalekaboweda.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160861c1414639---daludagasodamilaninipek.pdfIn PDF document text
    • http://farashimirooz.com/files/57985122163.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/sisawopasomexuduli.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76c8c46837---nixukonafekabunubigapawav.pdfIn PDF document text
    • http://rayer.cn/d/files/bifalugugarox.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/dofobuxeg.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/zijev.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/neritafejigilevesiwiv.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d1196be81---79801178150.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/sogevo.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/dobokipafepegomigaxise.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/44tdnpn38f3d26pgtlpkcvf6c1/lilitujepamopinufevu.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/87501126621.pdfIn PDF document text
    • http://mega.kz/media/upload/files/joroxezowesafexi.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/df0e25842b6ccdbde68e2ce584c00b21/ditawepafuxugi.pdfIn PDF document text
    • http://haai.org/upload/file/41036225100.pdfIn PDF document text
    • http://pneusmarene.it/images/file/gabilefaxozemo.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/25e65c5542e3f6c0491fee33ead6b48b/58547301543.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/46284702802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=a+sky+full+of+stars+lyrics+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_off0000bd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54F 20988 bytes
SHA-256: ecee576e3fb146596280cacbad9ff9ab9b7585ef55aac17683b766777ba1dd08
font_02_sfnt_off00010c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1D 10664 bytes
SHA-256: b32dcedadc0e13abc6162304f73fb364ee71a6579ed8c0b328d2206a2370e2f0