Malicious PDF — malware analysis report

Static analysis result for SHA-256 887ab56dbb1793ba…

MALICIOUS

PDF

89.7 KB Created: 2021-08-12 07:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 31f492d232f3fe1d6c23a183164f9cea SHA-1: c9de96fa531bc19e09b1d0f234998c1c3ef0a63f SHA-256: 887ab56dbb1793ba039756ec06dfb94f51b2adc2eb2d152a31400bca3b514761
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=what+do+you+eat+on+bright+line+diet PDF link annotation
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/hub03442dv190mlnt5n80nb0da/7181225058.pdfIn PDF document text
    • http://didula.com/img/file/xomamemuxudaxipavaf.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1212ae28c---sejazebokaminuf.pdfIn PDF document text
    • https://brickbodysupplements.com/newerac2c/userfiles/file/sowikapomupoj.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bltue2rqtcbeojai7cupl0red3/15779887021.pdfIn PDF document text
    • http://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/pevegagegexa.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429050421560842.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/labowamipis.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/79322563574.pdfIn PDF document text
    • http://kaptenhoki.com/contents//files/3179125394.pdfIn PDF document text
    • https://carlojans.com/cms/file/61323446625.pdfIn PDF document text
    • https://hagepoorter.be/files/files/77037985985.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f519346756---10970935817.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/99113150303.pdfIn PDF document text
    • https://tcremich.lu/files/files/xipewi.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/wekogisafofagazuxo.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/bawebumunugofarapotadigez.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/d7fdfada4391785187b7b4fd73c9fe52/nesojilopebulinizexekuju.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/08cd74b16fc27ec09d50a6d530c9d956/66418517579.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609586ba30a14---30320370228.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/rivibemadatiwom.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/79ab18ebe509fe31346b7a9c382f3a60/15739606629.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/11824957253.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_off0000f98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A5 10704 bytes
SHA-256: 7214a6c5b41451128ea4cbeb6436b51d0a8cedfe3c9e4e8ae441e74d0e97145b
font_02_sfnt_off000129e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E4 17724 bytes
SHA-256: c93c6c03b8a736d0770855c1ce3d608e0a932199bf9b20f8cb534d52c82281bf

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