Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4ccc72c7a4bfb2…

MALICIOUS

PDF

85.8 KB Created: 2021-09-23 11:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2169201f7d5c6fc373cbdbac6da2cb22 SHA-1: 1e16ab6cbc0bb4d70c444939974eb89a9f379739 SHA-256: ca4ccc72c7a4bfb23ef25ad9c8d075f3d926fc9060e2b422163acdf8404dade7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's used to distribute further malicious content or phish users. The presence of numerous unknown URLs indicates a broad attempt to redirect victims to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613495fcbfdaa---rimikejupidelekowezu.pdf In PDF document text
    • https://posh.hr/files/83990087528.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/16645107971.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/diwotejalorogezasamo.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/xelodejajusufi.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/gogenewamasukenobiw.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/sadanonifepalobuj.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/70770749874.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/9334250421.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141848792080---23857400368.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/gusukujefomasagibotoza.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/gamofepigikukunutikizuba.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/fetodunuzapije.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/27438239247.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/7613673348.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f8c563ddbbd809c1f2d8c945de0c1d6f/6565669162.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/luwenobiwimov.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/kurudamutamutaleni.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/loboripagomafike.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/92359e343a7efd6430d1fbc9e9685d31/fezetozisolofurixebojul.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16149b2a1b7b14---25884975244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=kingroot+alternative+2020PDF 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_off0000e2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB08 10412 bytes
SHA-256: 9721309612e757a7bdc4b2835fc5eaaf22ca073cf043e66bfa56eee9ab2997fd
font_02_sfnt_off000112c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C2 20948 bytes
SHA-256: 7cd030bf66a996fcb534d20a01b225667663c23ceee7805fff1685af48e9f74d