Malicious PDF — malware analysis report

Static analysis result for SHA-256 e45bcf99c14af57b…

MALICIOUS

PDF

88.5 KB Created: 2021-09-12 11:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2f9f95a9a26f2608a430fe9dc3aefc41 SHA-1: 502b76e8e066f1f5c286b4286d75901de464fc16 SHA-256: e45bcf99c14af57b8b04077d8b4f18f08b89c50582023ab6b28161ca1e628d13
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://fanti-fitness.pl/uploads/assets/file/57513977569.pdf In PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b37d3985e9---57522564507.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/wunokosepewej.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/29037068694.pdfIn PDF document text
    • https://adikketiga.com/contents/files/rinaluxivaxele.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109100505369992.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/35687623820.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/61745137042.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/26720496951.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/kafawuf.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/karekobevurujixapalapiz.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/vizozekenasifokumazijuf.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/fumaninexukum.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/funikoxinapopeze.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/57453926466.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/38608353769.pdfIn PDF document text
    • https://camphacement.vn/upload/files/madobazor.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/74bf9c5d4ed5342d80c14b5c34a7c4f2/92007948769.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/75107722791.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/9822277893.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360ebb24731---6008435117.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f81b37b80d---29492425710.pdfIn PDF document text
    • https://www.food-equipment-store.com/fckeditor/uploads/file/nepovudebitesen.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/54854145664.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/44592469748.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/daluxufogizuvebugas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=playstation+portable+androidPDF 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_off0000f628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF628 17564 bytes
SHA-256: 36b1f35b6a0fed9a5f134ea408b2097a92c4540416968a482fd11fcffeed5a65
font_01_sfnt_off00012388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12388 10640 bytes
SHA-256: 49ba89264bf48cf37c10cee66300a41def40e97ab6ec91769fc1cf24d2915932
font_02_sfnt_off00013bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1