Malicious PDF — malware analysis report

Static analysis result for SHA-256 175f816968c1766a…

MALICIOUS

PDF

88.2 KB Created: 2021-09-17 16:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2ab5167bdd51ca78752cb677160264ae SHA-1: 822b5ca5ad8bd1e2d45847f68a80633884eb5bfa SHA-256: 175f816968c1766ad7bc3cc848162b41ae9935abc55f16f3200e772c1f980166
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm or SEO manipulation tactic. The presence of embedded JavaScript, flagged by heuristics, suggests potential for malicious scripting to execute or redirect users. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/af8156619793210d3fcad95c28a22b9d/totapimo.pdf In PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/36739549331.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/80454931220.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/36454006543.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/33167451269.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/42283562088.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/vukaso.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/42143622078.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/parerovemamebisaduronu.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/sunimuwedapowute.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/49804940634.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/dozerabofumopititopam.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/kidogijata.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/kemebabiritar.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/rugalirogud.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/fajevemabovanefo.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/kozozewuximonipokumokufu.pdfIn PDF document text
    • http://philipsphotographystudio.com/tusiru.pdfIn PDF document text
    • http://yibetter.com/data/files/tutisivexupejenudorexukus.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/nilojawakiwexufaduv.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/46282774073.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/nijodojotuba.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/7ba031c1bbf23cbf2ef67845d12acf93/87279966155.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614368fa6d145---fukavowopulavilimakufajir.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/10228620398.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/rewosiposanozuzixamemilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=samurai+game+apkPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D4 10328 bytes
SHA-256: dec136c52af768b8f4ebf86026896107591747b0cb92f5afcffa1e6c42bd414c
font_01_sfnt_off00010b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B16 18372 bytes
SHA-256: 3c23a2b8904925e260272553102b0b2b376c3aba8d583da46ea55b1695d728af
font_02_sfnt_off00013adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1