Malicious PDF — malware analysis report

Static analysis result for SHA-256 311fb70ad16b5070…

MALICIOUS

PDF

71.9 KB Created: 2021-09-17 16:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee3dc1e6fcc65f9644491a63771dbf20 SHA-1: f0447588fee3090c74b0e950bc5f26bc93d23adc SHA-256: 311fb70ad16b5070a2b3823da8b47035f729680d876398840ee6784fb48da5e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://pixomot.ru/uplcv?utm_term=apk+freedom+2020 PDF link annotation
    • http://tahi.hu/ckfinder/userfiles/files/79246807999.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/lawapobedig.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/98281589186.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/86706471696.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/xuwakisamididanoparej.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/zinep.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/vizosukomo.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/xigibupumizakosodi.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/0palsartmjm67igioo2qooj247/44245279279.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/k51s4h2on5hbhagg6kk0nktm3r/gotulujevuxosibakadowexiz.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b499907f79---19663232505.pdfIn PDF document text
    • http://only-svet.ru/upload/files/27045940845.pdfIn PDF document text
    • https://topupdana.com/contents/files/684671201.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/safolemomixixuxozajezavun.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/gofevisezi.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nexasanaduzitonerixeke.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613781ad0368b---84388122594.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/5in3eh9kd9llasckmhqg3i6jks/91117687033.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/67403273875.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/muzagibipegagulasal.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/vemakurabovoja.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/87941366780.pdfIn PDF document text
    • https://webhosting4.net/media/file/bopepipojagi.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/gulapojazak.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/23787196776.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/vefewesaxewewemomep.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_off0000ba47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25E 10304 bytes
SHA-256: 9fe72041959064a68166affea2f105a9334f53168dc39b448f6302e3102910a3
font_02_sfnt_off0000e9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A0 15820 bytes
SHA-256: 2fa0185a15acdc77d16d72f1bd184607441eeec6f4439f50e2260acddaf886af