Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda264ed72814aa5…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 22:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e4b218b4d7b7e3232fc372bb7990b840 SHA-1: c0f19857427c85be6af31692eac02bc4d7b98bf1 SHA-256: dda264ed72814aa5c1ee1d4289a03b851e704d0754e0fe18e73cb0118a0aae00
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving external resource redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://inwebjor.ru/uplcv?utm_term=dictionary+of+science+pdf PDF link annotation
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/iuvilhbpo2uvquuugpj08eadd6/bitamumu.pdfIn PDF document text
    • https://anakmeong.com/contents//files/pudojamakuvisewafopij.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/55a408518c5af1dcf1de00b53e243ed8/827917920.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/85773306869.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/6639950038.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/papewikofezozosegamiva.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/94554988057.pdfIn PDF document text
    • http://standrewsparishhighschoolclassof1964.com/clients/70428/File/47566735697.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/42351709210.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/43264509383.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af751a3fe3b---zimezexadamusolakojuwa.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ddccda09d---mofiwob.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cec2d65ead3---jaxopew.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/54154826cba56a10cd1ce454354f5701/bubexe.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/fd11af1afd8fc070168ab1bfc727b0c7/58631906222.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f01c4a504f7---vivuf.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/5mqu62c9jdse23d84lud0pbomr/komimuwemen.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9a72263e5---51124590988.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/pukovejagarepu.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/jeginobupoguxuxazera.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/dexibawagexij.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd97086bde8---jatisokegelamor.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/30939295376.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/fudugedokipexapawo.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/40178917190.pdfIn PDF document text
    • 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_off0000dee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE6 10684 bytes
SHA-256: 93eaa2e70f57754d4e6372b7f57fd781050892a8e10f4572baaa55c78c7d1e93
font_01_sfnt_off0000f792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF792 17604 bytes
SHA-256: fd7edf51d5073bac71026a91a6a24fa7b38324a76d6cd0f2f82ca34fc9bc8147
font_02_sfnt_off0001252e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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