Malicious PDF — malware analysis report

Static analysis result for SHA-256 028a3c8790917fcc…

MALICIOUS

PDF

74.7 KB Created: 2021-09-03 02:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e8584de89e3ce69928f12001a1096d25 SHA-1: 3535338e25a0bcf94d425bda9a9437d688a3e4db SHA-256: 028a3c8790917fcc277ad23b8a1f8a47d0cd7252235a78323436b49ac1d91ac9
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised CMS upload directories. This behavior is indicative of a link farm designed to distribute malicious content or lead users to phishing sites. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/d73651e95d257c342ba131217cc37b68/24483331002.pdf In PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/19bd12ae6357ed654a901ce3b97ee3c7/pabovupaw.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9022436b98---54560223059.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160cc3b36af78a---62064999330.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/fasup.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6e0b062ba---bijosaxalikugik.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/fitojodikojag.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/44805436967.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/4f0aa71795ac4d4cfebef40b12338696/45616970420.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/o27nqtv99qeqlegovppb1ass0i/vomixibotewiwapex.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/bofus.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608109cb9b998---tabozozujiwisixu.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/91153451156.pdfIn PDF document text
    • https://0900107678.com/upload/file/47742612526.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/29228031596.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/gijufudamamegup.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/8669287574.pdfIn PDF document text
    • https://funke.be/data/file/xagafekudesirifu.pdfIn PDF document text
    • https://beautydent.hu/editor_up/wikagilukuzirazitixiz.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/2f78f81bf0455fc37154dc9bacb65e87/70691487320.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/74413378229.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/82729249412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=tornado+python+pdfPDF 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_off0000c4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCED 16340 bytes
SHA-256: fe646f04fbd194857da8cf0033c9386f42c9da5c8ebe386e4637d437e45d33d0
font_02_sfnt_off000106a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A9 10232 bytes
SHA-256: 3ae9ba2d7dbde28eac0ed12f7de6f3b1a34b7af3b0e7cb72688b22cb5b6f4b10

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