Malicious PDF — malware analysis report

Static analysis result for SHA-256 16422f65e5386615…

MALICIOUS

PDF

92.7 KB Created: 2021-09-18 05:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cff1fb784bf73f85bbe28cea93a7c7cb SHA-1: 40ac7c5995bdd16dd8be5fdef9e156092ac04cd8 SHA-256: 16422f65e538661575a3aeb1f5b7e0f6d430a841c2f6c522a26d7af557ed5346
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware distribution, aligning with a phishing attack pattern. No scripts were extracted, but the presence of multiple compromised CMS upload links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409963443b6---44209397744.pdf In PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/lojadupawixijuxojojid.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/d715fb9304df8066abf9c8840ef9f110/mizukofeji.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/dasitowamu.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/18471741664.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/kitadudepiterike.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/15217679933.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210914072955.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613bee4c0ce34---36276088192.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/65737766316.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/xisosetime.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/8288857141.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f5a9a7ce1---fojefejobemodomubipek.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/pf2dk8cvc087br44ig8r7d20sq/25343171424.pdfIn PDF document text
    • http://hotstamping.pl/files/file/zuzem.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///dogiwod.pdfIn PDF document text
    • http://15881588.com/ckupload/files/23473733959.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/16899911063.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/24436484319.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/62233968072.pdfIn PDF document text
    • http://becucci.it/userfiles/files/80052664482.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f1422f2c0---22869031611.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee9b77a549---ladidepodamowomapavenak.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/48237542519.pdfIn PDF document text
    • http://xsteelstock.com/d/files/6991750118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+add+songs+to+audify+music+playerPDF 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_off00010075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 11252 bytes
SHA-256: 11f31c7b038f35cae8911f3c46b09c593bf5837a91e7aa261dd5de1c4dda1c04
font_01_sfnt_off00011aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAE 19196 bytes
SHA-256: 765f4bec48ce1ef570aec7a48c8be740c7f9ed8dde0118766cbaa94b0c0ba1b9
font_02_sfnt_off00014d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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