Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28dba987bfa5467…

MALICIOUS

PDF

87.7 KB Created: 2021-07-26 01:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f8afee39cdc02b80996ef228143aadf3 SHA-1: 8f4d6746d03169bd126796966fc23ed40a0179a5 SHA-256: f28dba987bfa54678a595e4d8ac6042dd0ab579aaeec23ee5ee4be39d94e14b8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to redirect users to potentially malicious content. ClamAV detection and ML classification confirm the malicious nature of the file, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f866f230---robuk.pdf In PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/a3f6c213a69477ec7e3426640c0c6200/18127760228.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1975bf054---91985602649.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/98eb5d5bdace9b3a5d3bcdfc6c0a22be/fufotivujev.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4aea94e4fb---52687926464.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfc927bdc1---runan.pdfIn PDF document text
    • http://skisun.it/userfiles/files/kumikumufidorixemedimope.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742ff487e2c---kurukifo.pdfIn PDF document text
    • https://latework.cz/soubory/75851951076.pdfIn PDF document text
    • https://banghenails.com/upload/file/tulanikigufifozog.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70eef11b24---besutobezel.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/79139986975.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db01e5661cf---75343371659.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/67fc5a7a2150d5d118ab2df2410e6783/rozuk.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/laxisef.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/91287522963.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/56858525341.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/23475127307.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/1kt473tv1iv9a21a7iri6krv34/91662426054.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac968441c9---fejorovodalukotebagofiruz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=%D0%BF%D0%BE%D0%B7%D0%B4%D1%80%D0%B0%D0%B2%D0%BB%D0%B5%D0%BD%D0%B8%D0%B5+%D1%81+%D0%B4%D0%BD%D0%B5%D0%BC+%D1%80%D0%BE%D0%B6%D0%B4%D0%B5%D0%BD%D0%B8%D1%8F+%D0%BC%D1%83%D0%B6%D1%87%D0%B8%D0%BD%D0%B5+%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE+%D0%BE%D1%82%D0%BA%D1%80%D1%8B%D1%82%D0%BA%D0%B0PDF 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_off0000ea6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10285 11280 bytes
SHA-256: fcb0a717ec1515c8539e37e7b8be1e87c8520186fa28905a5b35c892c91bbe6d
font_02_sfnt_off00011cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDA 19468 bytes
SHA-256: b0d05493fb645389fe9a3ecaf95ed3165653d4b0a2c110f63e5e387c521f4b33

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