Malicious PDF — malware analysis report

Static analysis result for SHA-256 276e3c5f01de7a1a…

MALICIOUS

PDF

80.2 KB Created: 2021-09-12 11:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: abdfef8e4da01b8d2168cd9956e4c1ad SHA-1: 949289c00c81e5be5780b695ce82554ee26d7d50 SHA-256: 276e3c5f01de7a1a5329bb91ba2d99c7ace220a39d96edfe07238ede02a45dbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of link farms hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://allytemp.ru/uplcv?utm_term=average+rate+of+change+over+an+interval+calculator PDF link annotation
    • http://siamsnail.com/media/userfiles/files/miwavuvexafezojajuget.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/17722309000.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/fanewapuwupazujinanasafu.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/80417446257.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/39607307847.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0815d15a4---bomazawinogakezixewosor.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/sozexenakud.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/b79f880e34f8eb5f274d3ba58f5d7428/livadubutijuf.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/13981692248.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/gisegakul.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/nifewowuxulime.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f25bd3a9e7---tuvojelerebiwelaxiwuja.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/rezogomumemarumozax.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/84436491091.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/50757c60ead6fa968ab463a3705ea07f/genaloruzewukomoxusuje.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/52656529565.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/70056763077.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/pizaxakopoz.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/5700777083.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/niladogijipazuto.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/supuneniluler.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/wepajevula.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/88883940080.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/vinonodewegosok.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133472ec2b6d---67551694861.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB5 10592 bytes
SHA-256: 869bd0473f26795811022cd94937b41de80295143feb852265627ddec0d2b514
font_01_sfnt_off0000d5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DA 16256 bytes
SHA-256: c9f949e637614f427b576ae99e12473032bef173293aedccb3aba99e868eb0fb
font_02_sfnt_off0000ff72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11783 17520 bytes
SHA-256: e949da6121b7235ecc7a5bbc1bc754b6171d9f4be56d7bba4b4def753c1ba8ba

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