Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6550a63f4fc6b4…

MALICIOUS

PDF

79.1 KB Created: 2021-09-08 06:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f5a3c91b8fe42bcbd99ca7b758053094 SHA-1: d0e37a0a6245aaea2655695a343c50abe3d8d161 SHA-256: 7f6550a63f4fc6b4d5b0a2cee055a1fb3daa4942d3fe2d63aaf4a8cea7890d38
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to compromised websites, many of which host PDF files, suggesting a link farm designed to redirect users to malicious content or downloads. The presence of a 'download button' heuristic further supports the lure-based attack pattern. While no scripts were explicitly extracted, the nature of the URLs and the detection suggests the PDF is likely part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=converter+pdf+em+word+gratuito+ocr PDF link annotation
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/d1a43c3cb9a8285983111025ca450594/zenivusexuwiduxofizimuwas.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a64b7206083---29028262039.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/fbda885be3e6c3312f67adf4c2a5dc53/35829024984.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/93475285574.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/3caf377e81ae3e8fe735f29eadd89713/bowomijuwunewuvoxu.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16073b27950e7d---81966343550.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/volav.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/mofujibomifinalewa.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/dumodewotuxalikemubogozul.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/nedomozudom.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e1151d3d171---88511893082.pdfIn PDF document text
    • https://salwangurugram.com/files/99630469538.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/96d48659298087fdd1b467c0fa2c7aa1/nizeripokivufixe.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/lekujokuliwuta.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/majilalusilukize.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/stgv6728lqphf83h8l3ml3n4n5/58887009557.pdfIn PDF document text
    • http://www.moyekolodin.com/files/20086176524.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/91161182388.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/dalufiwewasufubaj.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/duwuliwanare.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/nuwasudusilesekogelevad.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/kofilozixinusesanigixok.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_off0000d048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD048 11032 bytes
SHA-256: 02628eba9c4f5ab487cc23273a110d5ad432da421deeeccb5332e300e3fdadd3
font_01_sfnt_off0000e9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D5 17364 bytes
SHA-256: e7ae3b7356bcb6c1be0d75c7c4146c41281fb27841e5079f2f0bc39732862914
font_02_sfnt_off000116ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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