Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b340b38d33c8cf…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 19:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b89b1ff40880033b2d25384651815da9 SHA-1: e22f8900cc7f604cef9b12b619f30bfb2beab58e SHA-256: e8b340b38d33c8cf8fc26a0ef32962e4e7b9b13964823c8ce7b8ea4e57fa2d38
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URL analysis clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://kueapem.com/contents/files/14638336908.pdf In PDF document text
    • http://irinaburmistrova.ru/files/tirupunejitizu.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/72bd15e32527c39ddb93bf2a8ea801fa/funuxufobumunen.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/60667562541.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/fad4457b30351dbc4ed3f71759f1d653/fipiwumofiritinoxajasur.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/43384496949.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/poxogafurogomivizupa.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/kuwaredomajofulivifire.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330c722cac8---57073496355.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613553ec0dcc7---23068979791.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/geposuxobimilevusopus.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/vilaxaleri.pdfIn PDF document text
    • http://balone.net/_upload/file///4452000278.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/mekanodiwetetomugekolikit.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/zolivom.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/49922377272.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/gogikoramopinulugofogexus.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/53231949460.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/82178266105.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/zibixuvuzusovabe.pdfIn PDF document text
    • http://salespate.com/userfiles/file/57795741547.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///17135768780.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/13652053576.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/47673352245.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=hacks+in+pro+100+fortnitePDF 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_off0000d51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51B 10684 bytes
SHA-256: 2e5e0a7b99bd558e7b62ad3c6d5f440f83af2c992661ea402398f9dc7d2e64c5
font_01_sfnt_off0000edbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBE 19152 bytes
SHA-256: e9322d8828dd855115ec48965b108128e66735565f0b37cac90b85e95951c950
font_02_sfnt_off00011ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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