Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ccfc694f2131886…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 16:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0530507c13a5608984712b42348ae73d SHA-1: 93fe3dd44a29b66df1d059eeeb5437c3388aed44 SHA-256: 8ccfc694f2131886e102fb400679245db1fd2154b8f54ba0c0a8c6100bb329aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious or phishing websites. The presence of compromised CMS upload links further supports this, as these are often abused for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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
  • 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://oniceh.ru/uplcv?utm_term=gta+5+free+cheats PDF link annotation
    • http://malopolskiszlakwinny.pl/upload/File/wumijezotuwego.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/rogimalon.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/692a3fd92cb6502cd085336df2a5c94f/5953349508.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/79994269777.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/sojavumanapogati.pdfIn PDF document text
    • https://aneri12.cz/res/file/77417785361.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/85725293613.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161490a5e62c8d---68261432220.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/jv84asf7g0n0opfkg3v3oqrtsk/35250805841.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/41554742774.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614ebfb34ca6c---2867760993.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/22934332340.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/3df70585bdcbc36f7939068363ade9b7/xadagatemenubatewotu.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/aaab71c1b73725751e42430dc46e8788/tulibekalaguwav.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/69390696761.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/24364751409.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/rimumezukalebiz.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/xogezenobizupategep.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090810515580554.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/dototomevijiziwawipif.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/6755593095.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/9452027912.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/el5kldr1pd5jidaqnjg7j59fu3/difilutazinisalugibirije.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_off0000b2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB00 15496 bytes
SHA-256: ab3281917f2f49a7dc29bc12c0d2ee427b6958a92431446d1441642b8f58c968
font_02_sfnt_off0000f2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B4 10244 bytes
SHA-256: ec018288fa0c8d71ca618fa49a656def4cb881566b5dddba133d1589142e5806