Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c66a2bf9e7af248…

MALICIOUS

PDF

108.2 KB Created: 2021-07-14 03:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 099039db8bfd2da91ec9c50392250795 SHA-1: 8bf7a45862d9de912feb216ff162e1090b77afaa SHA-256: 7c66a2bf9e7af24843877ab36d552ee105e13c028f6c4c19b65d1ec00c156b3e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute phishing content or malware. The document body is unreadable, but the heuristics indicate a malicious link farm is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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 http://sme1970reunion.com/clients/7/78/786f1e38e9ed540b4a7d4f5dbcc09398/File/kifamiboka.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/583a1250a5c3e6baa978f3b5d70e4c7c/dexonutivowubatatogut.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/db206e0dc63e5c50089a3ac776475aea/55513524296.pdf
    • https://dubaimotorcycletours.com/uploaded_images/files/92369916416.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898351b679f---vafikepasifazimafa.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/43b8dbf560955fc40748a9d4a0117862/29461382329.pdf
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/efvcajga6h5mm3umv150b6e48t/24001475518.pdf
    • https://esz.jp/img/editor/files/65916872221.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ef0qdrpm1jtva78r8eimtkrmk1/49281377467.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/17972a2c3aa2665bc2976bae1f5712a7/kitisenelasiro.pdf
    • https://escaletravel.com/userfiles/files/96151315168.pdf
    • http://internationalnetworksolutions.net/files/kesudutigarabobabotetar.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160775bc562e75---bomitaxamuzezumejedesa.pdf
    • http://hubbardfamilycircle.com/clients/62940/File/5967756419.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607533c6ed238---57742808472.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d83944b17---selifepoxa.pdf
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/40057883286.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea4df9e118---27463651295.pdf
    • https://ntiverification.com/userfiles/file/7736022285.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb9c82a36e---54539754734.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074362544e4b---dinijer.pdf
    • http://arohitourandtravels.com/userfiles/file/relevodu.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c839154dad---62001653119.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608087db5e4ac---44732103039.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=arabic+alphabet+with+vowels
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00012384.bin
b2e04c03b492d3c4d38ca59d37dd8eaa8c80e30f670b1a725651d63abecde7e2
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12384 33544 bytes
font_00_sfnt_off00010b73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B73 16792 bytes
font_02_sfnt_off00015ddd.bin
3c7ba52e7a17f7da1178d02f10a9d023fc841e6aead879660a7bc4508ec327c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15DDD 10640 bytes
font_03_sfnt_off0001763e.bin
9419d22c937663f334a2befffc8f71573f1910b7115a8a7b602adce86e3a73b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1763E 17720 bytes