Malicious PDF — malware analysis report

Static analysis result for SHA-256 9840325f6a4d8960…

MALICIOUS

PDF

136.3 KB Created: 2021-06-25 00:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 54b48a590194c0f5dd1ceadae2e8fb96 SHA-1: c0daf2cd480e120976dbe38949cedb933499cb36 SHA-256: 9840325f6a4d8960226bceeaa8c2c718d16575137693f7f25745ddd3f78b95ea
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The heuristic firings indicate a link farm designed to obscure the true destination, with one URL specifically mentioning 'ab liker instagram apk', likely a lure. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5857

Heuristics 5

  • 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
  • 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://irlanc.ru/uplcv?utm_term=ab+liker+instagram+apk PDF link annotation
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/4898f59826df54f3e1f1f83465f09b7d/bikonegudi.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fba2e17b31---kepudo.pdfIn PDF document text
    • http://adveotec.com/img/file/88446830670.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/24777303671.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/bupovozeviwusividorugob.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/bkdqc355p85bkp2sol0c6c09h7/xavapemovofuraw.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb4a88f2db---87187792994.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160adae72b5340---zusefazerakov.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/rjv9vi0fclqpimtthgeljg5og2/gebokasomazajirobe.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b2f2853dc---gelek.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/4292b27c08febc1d7a40ca858ca68df1/gelorogugoxazofurorevera.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/2vum8ujcpgg0avtn5hfmpmsgkv/53394949663.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/oo9idau0l4nlrr9nrb1rgff9oj/40546135073.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc4e130b89---lajelaj.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/30839899325.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/pulematoraruwunidebogofov.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb093e07fc---gojope.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/571e32a46e015162f917bcbcb63d8daf/mufiruwironudeno.pdfIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001fd09.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1FD09 12444 bytes
SHA-256: e4ffc1104113786acebfe5ae2684350388a43fc4b7cb56df67b70627d9ba0bcf
font_00_sfnt_off0001bbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBCF 2952 bytes
SHA-256: d8b907802410e675ceca2784509e58a9dae2947c1b2ad43e3e0c02687eabed47
font_01_sfnt_off0001c65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C65D 5332 bytes
SHA-256: 982d111c218818dad2330ec0b0c0ad689991cddb87ab4bf64dd96ef944d1afcb
font_02_sfnt_off0001d865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D865 6776 bytes
SHA-256: af1b9203d7b7adcebadaa9e1c1816b0d1f6580b04d1b8c3787db344e56d8c1bc
font_03_sfnt_off0001ee84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE84 3568 bytes
SHA-256: 3f46b2edeaa223e29e0948c3633da2743ad4b0900840d3c7729fa2feae66aec0

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