Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cbae7fe8be674d0…

MALICIOUS

PDF

93.8 KB Created: 2021-07-07 11:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b065488442d40096e7e1d6ae1524b00 SHA-1: d389abf5180e1a973d0a37c9749aab0f4be19188 SHA-256: 7cbae7fe8be674d055f98468f641ac6bf5a94f2d1e77c0f34f9800a46fae11cd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on compromised CMS upload directories, suggesting a phishing or malware distribution lure. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. While no scripts were directly extracted, the presence of multiple external links and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.aqsclimited.com/EditorImages/file/jifekirozafaresupan.pdf In PDF document text
    • https://egf.tw/test2/images/file/33199583795.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/rvuiidv96g08qu132bej0isrp3/917244230.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f7b85e0a42eec648c1b056a477a71138/82875385287.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/49454197809.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/e45a09b7d8c6b2982832a1be9b49aac1/39506297586.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/21149143744.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ace7001f0d0---vawuzowamis.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/a5fcfc106549229059d9265cacce56a3/fiduxaxof.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bd955cae2---votolukopawuvisojuvefo.pdfIn PDF document text
    • http://07-3739589.com/CKEdit/upload/files/51921393775.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/35710581859.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/lowosifobaramobebapozul.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f77aab6d8f---nogofef.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fda587554---63080743302.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e008597ea7---depidejun.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/a43193db432a202118f6960e48a5e4c4/bidizededofoxonusanej.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/50397425242.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/0253d6bcb7b09c513eff58b48475bf06/36208723621.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/32730766568.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ec4f9ce09---xajapivipadoxika.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/c6vpmeevc61j8ve8h8t7gab8mm/78525484928.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d66f83f979---51474433204.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/14562533419.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96d4160f8---12901819028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=eponym+definition+and+examplePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CC 19520 bytes
SHA-256: 26e77d9ee4b121120ec7c0725e4bf31b9e6af573f8a53789a1a6349751950da8
font_01_sfnt_off00012760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F6D 5132 bytes
SHA-256: 58194a7f9067ae332b28b3b73301d2d22f83c44e27c2c7e4607a07cf28c4579c
font_03_sfnt_off00015155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15155 10592 bytes
SHA-256: f82b1003ffb02b8f3efd78b44b498e92c22de344c2f5bae1b00d9c35096c5244

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