Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1cee44700efc7a0…

MALICIOUS

PDF

83.0 KB Created: 2021-09-03 22:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa4cdf3acd97ace5ff506bcc47ce1930 SHA-1: d533260e48cb96168240f27e8f9cd1f9967bc7e7 SHA-256: d1cee44700efc7a038b041f72f7807d83062908f447851290dfb51068b2053cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites hosting further malicious PDF files. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to evade detection and distribute phishing or malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/e2abc7cadabbbc416364b7918c80436e/wovegas.pdf In PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab2fb1c2d---mofupodo.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a985e51d---ronafonog.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1f6cc5a5c4e7cfce876b95bb935b9e59/wizilosoxowogifez.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/2a6eb965d30fd15b2a0a7d24693fb8e2/lumuvalagexofenara.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/3280696753.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607623bfb78d8---88784534592.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/vezimuridozafo.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/7770009437.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16091656c991b5---napuxategenafir.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/lasijazafomegon.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/7g7naoul12u2e3v4fjnqfr1cer/samasisikafefifor.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/62090601602.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/57331587373.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/38152117215.pdfIn PDF document text
    • http://smartarts.bg/userfiles/file/fasowim.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4c97cbe8e---56135541725.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/17913207407.pdfIn PDF document text
    • http://ladue62.com/clients/2/2d/2d0487a90c18d3a1b3df44839405a665/File/8985742862.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/70090374752.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/21704064438.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/86669387420.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfe17dccc5---zezoliravukijixokefim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=hp+laserjet+pro+m402n+printer+manualPDF 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_off0000de86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE86 10952 bytes
SHA-256: f0c17c1b3d8d19ab69991fc1c38ef9a2d345b41eff484e90dde79b69a81ce693
font_01_sfnt_off0000f7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F3 17840 bytes
SHA-256: 162df365b890695267d4df1098d8debdf146a1a2d2f588c25a2395a6c08456e0
font_02_sfnt_off0001263d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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