Malicious PDF — malware analysis report

Static analysis result for SHA-256 3064f7fad996b21d…

MALICIOUS

PDF

93.5 KB Created: 2021-09-09 22:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 945427e006ac2f4de79d9d693e3e105a SHA-1: 011cab6e8e94e39cb2f8f77a3ddb952b5cfaeb19 SHA-256: 3064f7fad996b21d2475d15e5d28060e26c8c4bd28825b16c34ab43c710af843
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links, including those with 'utm_term' parameters, suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://coretry.ru/uplcv?utm_term=future+client+2b2t PDF link annotation
    • http://gildiamasterov.ru/userfiles/file/rotitow.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/pulesafawaxedojugifasej.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/6586c088922911c0051fd834744666e5/7526807090.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/kekidisepigutir.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/cv9i7on5jhebahtl804kgqqeen/filetarejivexetobop.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/xolutelazi.pdfIn PDF document text
    • https://seikai.jp/free_images/files/83111153546.pdfIn PDF document text
    • https://masukpt1.com/contents/files/60864631143.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/45390613177.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/52697102819.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/wajibakugobimexinajebozid.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/81417700401.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/natigalig.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/42103785564.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/fazebixogekofawalaba.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321507cbd7c---60732425673.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/2269252565.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/duzedigiwelub.pdfIn PDF document text
    • https://kimcert.org/E/file/masivup.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/kimividanoxas.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16131d0e8ed0a1---legidewidizujaroko.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/98050887151.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109030019556433.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/34960958905.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/p0qgqsegro28jt3v9lgplofp35/21083380499.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_off00010790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10790 19056 bytes
SHA-256: 55a30a809b6a2035f05eb81b26639247775d894f9d5aabcd0387ee42d30d1133
font_01_sfnt_off000139d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D2 10108 bytes
SHA-256: ae30d5dc97824bede86d69e191a73dbd5a2865bd3389e5c3ac5e95576e467a41
font_02_sfnt_off0001507c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1507C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1