Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8c28a28b562516…

MALICIOUS

PDF

83.6 KB Created: 2021-09-07 02:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c3459fe866da10d2011ad9f612c75620 SHA-1: 699b63a3cbe9b72d10f7b2336487269fcfe73c66 SHA-256: ab8c28a28b5625165043c7abb63a250f3ec1b5a82fb074b06c450e5f13ba095c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The presence of embedded URLs and the overall structure suggest it's part of a phishing campaign or a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160853a4f5dde2---84762249868.pdf In PDF document text
    • https://kurtoglumob.com/upload/file/vejojabinofamolekovur.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/45106077496.pdfIn PDF document text
    • http://it-hair.com/userfiles/87780976822.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/gazetagejuwufurijuloz.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/55843382795.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/dutuweleletowumonuzipin.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/4bbc5ac85dd9b71e85555cf15ed58c68/jugit.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/51231689971.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/defavilerinijanenonas.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/togoka.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/womowukolekitewaxaru.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d43415a9---58047455000.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093e4a692fd7---meziferukuredi.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/61916767122.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/8d038a9aa34d628c960fd5f4fe597ec5/rizujuromo.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/16902974988.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/300ad1et389l0anu36e8264ire/genud.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/kotufezagamatupere.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/80813722263.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/zupefegigewesawixuwalopaj.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/kanajopenamekivigowu.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cce5926879---soxer.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b730b990ba3---88948417575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=preterito+perfecto+subjuntivo+ejercicios+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_off0000dc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3A 19988 bytes
SHA-256: d268e574911b5e710d4b50c747334fefea00549fc999ea8d33bc89b58c7a0993
font_01_sfnt_off00010fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA8 10844 bytes
SHA-256: 5736b9aad43789215e529be739c11646e31285a34d79c3df058df82c4bbcc50d
font_02_sfnt_off0001289b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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