Malicious PDF — malware analysis report

Static analysis result for SHA-256 2013b21df16cc93d…

MALICIOUS

PDF

89.3 KB Created: 2021-08-11 15:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9f2596a79ddd19ae026c0211d63b7893 SHA-1: c9e3280f4afdd549f6507d5bf10ec961c39724a2 SHA-256: 2013b21df16cc93d423313f212ab3263a5e0678e7ae7f7ded2eefe2564bb9522
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to other PDFs hosted on compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/775a09bdd2962e97543120ba9d1c82eb/kazorejuluvanefosis.pdf In PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c938a06a290---70294766929.pdfIn PDF document text
    • http://juha.be/_files/file/4958841093.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/de2d09480541f8f07b1b8d02727b2b9c/sekenirebiluvonowunur.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/dezulufilonadabete.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/1h654bp0ta34ldj06du3vtecnr/59961892646.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/3160ee870e33a084d9d2a688dcc451b9/romewetekikuril.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/bapip.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0cd7c80b851c2c2e46e7bc3df19304d3/97882002375.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/0c9aa3a7a5b2a22b1a18a1a0be8e9431/99585193598.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210730075630.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd0cb936c1---fuxigigetefijozok.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/07/30/file/20210730_123209_179.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/39243696715.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/23237137188.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf511c26b9---repojiwiwufapaseruxefu.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/b78bb41b74ebb9e881855da2f9e365ff/20690295662.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/t4bfqrhhlkso65fj9isggm05tv/gujixusuvijelizuxadaretim.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/n06h9qd4sg8splb300fl7mngib/62323481149.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/17885718155.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/43801944809.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/73008768442.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/83044847352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=teaching+social+english+interactive+classroom+activities+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_off0000f78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78F 16692 bytes
SHA-256: 09d918d3f9a03a17a7eda46817c893dbc87b010ae8bba6bd8ada855c6bea9aa8
font_01_sfnt_off000122e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E0 11096 bytes
SHA-256: 04c7561c7035255f8c67b4c855319b713ed7764f7c4552edf189b3c9e157a990
font_02_sfnt_off00013c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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