Malicious PDF — malware analysis report

Static analysis result for SHA-256 651b7aea9c0fe18e…

MALICIOUS

PDF

82.4 KB Created: 2021-09-15 17:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 99db166b9833fc6286eea3c44285a6e0 SHA-1: c00cbf5b08d26301d91917b6e08b71b50e46a5b5 SHA-256: 651b7aea9c0fe18eaee4e5333ef78280d5af6865c9a1b6f6397b8b5a692c8def
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links pointing to compromised WordPress upload storage, indicating an attempt to deliver a malicious payload. The presence of a 'download button' heuristic further supports a phishing or social engineering attack. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://kpdb.org/userfiles/files/gedejefazekerok.pdf In PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161340e29ef077---furoxuxoman.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613754a4eed73---lepigiwivesogiwik.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/gemovafafimiwu.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/sifenepujuw.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/ziwabebelejewudomomunewe.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/telitivid.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d784316fa9---87175854891.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/84291036928.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/diposapulufake.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/23015821097.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109120801273303.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/93823662479.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/davolilaxuxegifimetap.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/xomopekilin.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/fajoparizuxozuwaxade.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/85582673242.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/rogakug.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/jaludubiduwukomimamixi.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/7c2a4c76313a877dced962d8e32625f8/rotolutaluworipuwepakin.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161344e59a8611---gasasabasit.pdfIn PDF document text
    • http://esteel.my/userfiles/file/61848249830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=idm+6.38+build+22PDF 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_off0000de6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF681 17784 bytes
SHA-256: d1742dceb0c597ea58016698988c180d43d9a616802080d2ace419a67998834e
font_02_sfnt_off0001250d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250D 10452 bytes
SHA-256: 79a6ebc839a1e766c03e0ea3f2a2a69b1c35a4d09212752b12ff430cd128408c

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