Malicious PDF — malware analysis report

Static analysis result for SHA-256 873e0a5db44e4e48…

MALICIOUS

PDF

78.8 KB Created: 2021-09-23 08:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de4519b99baa9415e6ff86600343ecab SHA-1: b2f00fad14feac2eabb1fa8f63eb94bcbb3ba83f SHA-256: 873e0a5db44e4e48e574c0916df9347d4c2b0fa34ad88367fe66b8f4059883e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. The embedded JavaScript may be used to further obfuscate the malicious activity or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://huntic.ru/uplcv?utm_term=super+smash+flash+2+m PDF link annotation
    • http://toroisg.com/public/images/files/77601656479.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/e514b174bc8932fe11afeb7cb9abc75b/lonixusunapegoxa.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/53611658185.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b9835b92---91514464730.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/35334336416.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/xodawimilefujije.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/nabiwinotu.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/kawarovadapixezo.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/xexizukijejajasow.pdfIn PDF document text
    • http://laguna.piyawatgroup.com/images/files/23885530652.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/11121487477.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/46133881035.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/65775145631.pdfIn PDF document text
    • https://hssanesteban.cl/files/pivonorukagenovagusuk.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109140954194938.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/xanabafuwobixexariwefemi.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/muzuke.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/65942752752.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/e5c912db3f17ce38de18652fba9eceb9/9759943203.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/gusuwadetuvavufevama.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/47586119636.pdfIn PDF document text
    • http://etevent.itweald.com/uploads/files/6146723b6fba8.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/71957461681.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/narebikepoxinuwutufuxip.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/gizapegoli.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_off0000d2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC8 10504 bytes
SHA-256: a67bd04897769f3cbc9819b6979c4ef2725b71c7f4f25a8e08b33f61cad33979
font_02_sfnt_off000102b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B2 16684 bytes
SHA-256: e2c1e7cbee1004a1c91db57e7c1cf44dec0127195e4894137fc7c1f68129e2cb

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