Malicious PDF — malware analysis report

Static analysis result for SHA-256 83eece6902cf82cb…

MALICIOUS

PDF

95.6 KB Created: 2021-08-09 02:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: d9832e5bb6e021c91387eacd43cb270e SHA-1: 7ff9f0c82d5a71a50352229b794fd59ee020da2d SHA-256: 83eece6902cf82cb84963e147229f2d52744f4266a2d454b154862c47e11b417
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm pointing to compromised CMS uploads. The PDF contains numerous URLs, many of which are hosted on potentially disposable domains and utilize WordPress plugins for file uploads, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/japqttrm1962j5fkoec0jraom7/kulujanurubigabokiz.pdf In PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ded0a4eeec---97133112642.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/68733287578.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/miwuvesiwedoxanep.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d81d6b798---31428235356.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16087a959ecef6---tavusazowuvisagi.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/wedakip.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc1a143c84---2624760911.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/99075709046.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/tepureburutiworej.pdfIn PDF document text
    • http://capri.lt/userfiles/files/91619720027.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/80355520364.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/81235632443.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/83599000919.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/dadelixemabumu.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/afc66774d90302fb8b3323cc6178c11c/melisalatobako.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/dovajurusudufojituwiraf.pdfIn PDF document text
    • http://lovemyskindayspa.com/clients/d/d9/d99ed7cf7cbac978b7326c22a81d1608/File/94367615108.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/vonojodibibozutivitugifo.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/31572858206.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/wosagufejim.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/391739966.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/labizubulotizumumude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=teks+mahalul+qiyam+barzanji+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000147ad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x147AD 22700 bytes
SHA-256: 1b0140863ddfa5ceb6b26c87d018e842fb1d90818b1486fc2ecf2e77ecf32791
font_00_sfnt_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10405 16188 bytes
SHA-256: c4eda455da8b0dfad2e0fc0604724f48453cf002cd072032203cb43b068c7688
font_02_sfnt_off00012dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD2 11292 bytes
SHA-256: ece0d8cee6f9b21eb2449fc27fc680f48f1bf31842cc54d0031ca34c17b1b687

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