Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c0226c63154fc1…

MALICIOUS

PDF

71.0 KB Created: 2021-10-03 20:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8d00a964218f273afe29b163e3e17904 SHA-1: 30f791d10f83e73e22508c316c6680f9a91928f3 SHA-256: e4c0226c63154fc1cb94248fc9fd6f91f9b44af55553305d3d0337e8698c871c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites, including one hosted on a compromised WordPress upload storage. The PDF's structure and embedded links suggest it is used to distribute malicious content or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://aerotherminsulation.com/userfiles/file/ponarolaxegajorakez.pdf In PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/82815846312.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/40770643297.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f3009acb58---73916433534.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c03a20a76---68861500656.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/60720460817.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/52727555897.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/68109210149.pdfIn PDF document text
    • https://duel.pl/userfiles/file/32708845841.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/14703609155.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/49458659311.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109250408563855.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/30525110112.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/37979886465.pdfIn PDF document text
    • http://melabo.com/upload/files/25296936879.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/didewawukel.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/xebumom.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/sefose.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/rejatirutivanaxiw.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/rutapuzanatunujegajox.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd8342211b---tifezedunet.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/35982889737.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/5962380066.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/49821684186.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/40902417411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=third+party+candidates+running+for+presidentPDF 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_off0000b452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC64 15520 bytes
SHA-256: c8f89cb7cd333edb00e150268edb1bdb9a33a14f7a826c2a92967c8f5f4f94b4
font_02_sfnt_off0000f3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F7 11028 bytes
SHA-256: 121d256ac6e53cef23b48d9420542d1545aa4e45bab85f0bd7c507b25ff90e83

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