Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7f316f6cff2879…

MALICIOUS

PDF

86.8 KB Created: 2021-09-18 09:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6cc4695daf215c97b6801b0272ab6c95 SHA-1: d6e5350a4c4d1051feeecabab81335247e3b83b7 SHA-256: 7c7f316f6cff28798732970628c976337066c749a88856225b694edbf4174b17
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream, which is often used to download and execute further malicious payloads. The presence of numerous URLs, including links to compromised CMS uploads and disposable hosting, indicates a phishing or content-luring attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • 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 http://hzzxtl.com/UploadFile/file/20210906204714827.pdf In PDF document text
    • https://tepatsasaran.com/contents/files/64651605342.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/65727703602.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/dotisaredojo.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b63c440f58---ketiwo.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/41599260955.pdfIn PDF document text
    • http://ccadl.com/files/20210912050050.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/vekp8u1fm1oup2g10ell4kbgrc/mutijikeridoxa.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/23972067089.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/dejefalubinoz.pdfIn PDF document text
    • http://goldmustang.com/files/files/67778738640.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/biwaladiwo.pdfIn PDF document text
    • http://bluebossa.pl/files/file/puxumupalotezitadonuris.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/zilizijawosamuxir.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141969256f51---43457622509.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/siripegenede.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/tinavikosojatarej.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/26334670065.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/gisokomub.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/8106127458.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/kuxobepub.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c203519398---64406992449.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/72883424357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=applications+of+machine+learning+in+wireless+communications+pdfPDF 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_off0000ecc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC6 11232 bytes
SHA-256: 1d63a88ee398c1203f91ea9b6d10eb0cb91698b75c929a908e108eee33d47732
font_01_sfnt_off000106cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CB 18028 bytes
SHA-256: 1ccb15e5e63803442efc17f64c2973a285bd0f178e434175276bab1938a36575
font_02_sfnt_off0001351e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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