Malicious PDF — malware analysis report

Static analysis result for SHA-256 3261dbbcbea30a9c…

MALICIOUS

PDF

96.2 KB Created: 2021-08-19 10:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9e1092ff7170333e74401f9edbc8944e SHA-1: bf74247afd36608b9a1923f61e096344f440e958 SHA-256: 3261dbbcbea30a9cffebdd820cbfb6227435a3c68d12b8303f3892802545615c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple PDF files hosted on various domains, some of which are identified as compromised CMS uploads, reinforces the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 http://espressoperfetto.nl/app/webroot/files/userfiles/files/jemozixamuviwiligijanawu.pdf In PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b616fa55bbc---fukifasiraxuwo.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20e6952001---zawuduwabudasizopu.pdfIn PDF document text
    • http://esistore.com/userfiles/file/67269581752.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/9c3214e33fa8f083fc6a486a7d32399a/ludojominekumidosejal.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67nkpc574fjf5dak1r8b03i4m3/kosogipanoripukirarepa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa284fa32---45166382036.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/wibuf.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/28963931926.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a406c4a980f---9819738781.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f240b577e---98666472714.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/wovogemexudejebulesu.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160762a1dd044c---16992739314.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/52613627736.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/movasuli.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xaradarogikozudetetewonew.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/vewavejabagomej.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/sererajelus.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/73382562474.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/duxutisomakokasorago.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160da392fd9af3---70822026561.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608099095f047---wetivi.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/fbd825505583800f30ae8d111c2d902c/19521871928.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/87130746839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=minecraft+descargar+gratis+para+pc+sin+virusPDF 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
font_00_sfnt_off0000fc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC35 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_01_sfnt_off000111b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C6 18596 bytes
SHA-256: 569b80067fe771419c117d39d612f15c2efccb7e3ebbd59b09de809f70d1aac0
font_03_sfnt_off000159c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159C1 10788 bytes
SHA-256: 979ef851b7ba10ae421d423c20927b4f613e82b1d8d7040911d5e3c343fe1528

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