Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04f1eef210b8cda…

MALICIOUS

PDF

79.1 KB Created: 2021-09-13 10:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c5e5e4d1f28086a846ab57573c4e984d SHA-1: 5442799c42e99bc6765f454e78cf8563430c526e SHA-256: c04f1eef210b8cdaf0c3c10ad8583aac1ca5788f11d9ccfe35aab1f1b70e622f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=demian+deutsch+pdf PDF link annotation
    • http://proximeo.com/ckfinder/userfiles/files/1649070314.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/a54ac20eca1e3778bae42b07d3172352/vekugoxa.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/26202142012.pdfIn PDF document text
    • http://e-sportis.com/images/upload/29588252274.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/takubidusogigid.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/pewejawa.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109011812351312.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/51363323220.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/55430226579.pdfIn PDF document text
    • https://partetesal.ir/data/file/74094829520.pdfIn PDF document text
    • https://akemi.ro/hirek/file/susudewupazat.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350c67d39d4---17048335917.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f77440d2b0---56537932338.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/silaxajoxanigepepop.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/dcdpdbatlre3l2lucs70bm2fff/68935459915.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/84518421852.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/66805480017.pdfIn PDF document text
    • http://vladekoservis.ru/files/lumutaputupumaguguwom.pdfIn PDF document text
    • http://centrons.com/uploaded/file/1456649117613a160a017db.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/dexonitadotebej.pdfIn PDF document text
    • http://greenld.com/userfiles/89512852027.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/lupijuzimazarejizuji.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/devogusupotosoguwojogiwol.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e03febefee---76497873897.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_off0000c866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC866 10720 bytes
SHA-256: 13284eba878e3f7c0c6947ca6256dbb06e7594870b2cbf8377f4f014ae2cb10b
font_01_sfnt_off0000e0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CC 20532 bytes
SHA-256: 9a8fbd8c4568e1ee094daf28720bc949c2eb87975966cbd6f24d067b6551e132
font_02_sfnt_off000114ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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