Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6c7944dbfe077e…

MALICIOUS

PDF

81.6 KB Created: 2021-08-12 13:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 54542ee45715a388fe26e1be045f12b1 SHA-1: 460b18c6ed6fb0d1183d4def5f1d915d836adde3 SHA-256: 5c6c7944dbfe077eb38484b1a47fa353a1eb29c1bb60165b669a930a350bb5d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to compromised websites or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://masonlegacy.org/clients/61515/File/tanasuli.pdf In PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/994389ca89d1bb855af6a28538700034/66025613307.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/lawevimobupezatatek.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/bivuzigaxojizetik.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/xudajibisasuwugis.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/mimedo.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/24539991769.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607574afa1c03---sajujalilezenilelas.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/40101430921.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/rogin.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161011715643c9---gewibirazaso.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f63411a85---wifelijujozevezig.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/77973298343.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/woxuraxu.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/rezowu.pdfIn PDF document text
    • https://mszukam.pl/dat//file/kenipu.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b65d6cae1---26788568494.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/sageriri.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/6480dc658eeb7389ec594e5e5b2f19bc/papuzugipu.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e44863ba18bebff83c7c245c9ce1de6c/dumexoso.pdfIn PDF document text
    • http://underbutter.cz/download/foto/fuzolevisamojevuxim.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/654dff8403e8885acbd630fcd53197c8/4799098468.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/b799lsdu010tvghcdkj9i8u1o5/59788679319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=free+printable+fall+coloring+sheets+for+preschoolersPDF 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_off0000dc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7A 10876 bytes
SHA-256: 291a3278545f0fd8bb5b5806a86c3deece635487ccc9e0606b3996e1db5805d5
font_01_sfnt_off0000f545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF545 16356 bytes
SHA-256: 06c92199403c7b88ec27220252818388c7204968ccaeaf9950e844df9a5b6c07
font_02_sfnt_off00011f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1