Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23b98228ff01abc…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 08:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 440879123e41b4d31e4f5820841060bb SHA-1: 394ff26416078b4140af18cacc93e8adde68898e SHA-256: c23b98228ff01abc1381be087495ff6796f5c59a0342968ee4d4483b10394402
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and a large number of external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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.
  • 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://irlanc.ru/uplcv?utm_term=assassin+creed+identity+apk+obb PDF link annotation
    • https://kurtoglumob.com/upload/file/20272049024.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/67959704882.pdfIn PDF document text
    • https://cmf8.ir/data/file/jepupizanilutivovizamadom.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147e83ae988f---bajeduzegesipejumejebajel.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/nuxaneguwigufojo.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161468e3405a17---misoredaluxewusone.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/vifawib.pdfIn PDF document text
    • http://epmachine.ru/d/files/xubexalili.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/47651859777.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16137d54d03530---buzesogeruvomuwiju.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/2747674763.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/19003271407.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/47459143560.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/0106666f337d7a934c691cd45eb9a9d9/gebofutiwesibuloladebi.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/sojonapatipezane.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/kamuzizuzosasadiw.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/16495383050.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/63382768889.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/654712307.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/15914100662.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16319996628684.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/ketufovapilixasem.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/40020395233.pdfIn PDF document text
    • https://ibericadearmerias.com/file/gojadeterarakubefil.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_off0000d7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F2 10788 bytes
SHA-256: cc633d10ca2a8698873820aa9b6edd8b89ca05b4a57d81feecde200e1f9dcf9d
font_01_sfnt_off0000f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D2 18652 bytes
SHA-256: be687b326075df68042d8b01ba3fc303dcdb221ffed3b6c6b8b6ba5508a17926

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