Malicious PDF — malware analysis report

Static analysis result for SHA-256 078d39a03156d02a…

MALICIOUS

PDF

78.1 KB Created: 2021-09-02 03:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 70efd8c5abbd14ff60e24bae31bcdab6 SHA-1: 0f8c520f094a9c99336c382b73ec747805609909 SHA-256: 078d39a03156d02a32f2588ce71bd4d0234001461a6af2352e5af0b170998b09
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://smidgel.ru/uplcv?utm_term=and+not+exists+sql PDF link annotation
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/9ca9d00abbe6a9885b9112dab5ce6654/42728359918.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085aa2d96544---bodipobebefulaj.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609be810c6561---53595019277.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210621/file/16242265555201.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/7iqo81ebbrdd91e73pfcv3t3vk/93184840635.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160968f1ad0c38---mugozazedepulojeb.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c4b8d0ace885cdc6526d1193011638c0/zepinosovibepidazo.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/86d52a4a76deac65aa687ec3674b8993/wakalozazikogin.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/xugufabotilodolapiw.pdfIn PDF document text
    • http://kaies.cn/upfiles/210815102307946643g21cbk.pdfIn PDF document text
    • https://toocapen.com/files/kitixubefaforapaj.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856ae4da6d9---62996915303.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/69098712322.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/npo1pd38c6ktfqco0l6hki62e0/32676984261.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/kilukenowoxikagugituru.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/sapusamosemiwabarewetoxa.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/39127489490.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d06c16d42a---88020483155.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6f2f2be370---niteposisoxipodimir.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/vulafiritotomu.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/luzuwurebamanizolijeta.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611b5dfd65e0f---vilitalidibu.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/netuzakiredifidakigo.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/15282839372.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_off0000c9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CC 10208 bytes
SHA-256: 6782a35187dcde755f4e8904cbd7e0fc831696afd3933c6c780ab6d4d94ec8a7
font_02_sfnt_off0000f899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF899 19576 bytes
SHA-256: 6680333385b55c22364b91bd2af1d478244672550383e23da7e8a2b80b0d70cb