Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb53ad3a3159442…

MALICIOUS

PDF

93.0 KB Created: 2021-09-02 05:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3f111ae60bf9d19474fbfada0ccf0b27 SHA-1: 2c0451d257ff58ede705d6d97da88fcd63e4b9f1 SHA-256: 6fb53ad3a3159442b75638b3d29f18ff15593c2746b9656a783f9667bf246808
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised or disposable domains, suggesting it's used to distribute phishing content or further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://cravaluos.com/ckfinder/userfiles/files/wexofamexisilabuselasewol.pdf In PDF document text
    • http://rlangkhan.com/upload/userfiles/files/rozujejojoxekubelodeziraf.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac01c135e4---29279895955.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/58757071201.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/21425210405.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/wigipefifox.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/rasuvutotokojasusotuf.pdfIn PDF document text
    • http://clingac.es/d/files/8313174862.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210518144827_557953997.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/30243200397.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160fa715c7fbfd---98272623828.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/rl4t4jeadusfjssdv6oo5lcof4/25827229971.pdfIn PDF document text
    • http://ashioke.com/images/library/File/ramilolinibigeke.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3e2268382---punikotumasona.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/o4i33vko5s0gqltfkir1udvapa/89008032885.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/38095263636.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5cf14873d---gavixerajap.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072708da9690---pidajara.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/5333217315.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612417d58edf2---sipugubofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=gst+on+lease+of+landPDF 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_off000108da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F1 10196 bytes
SHA-256: 92a2135bb726b798d579911fde9533aac9366d1e0ba1476708747c07dab26e19
font_02_sfnt_off000137fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FE 17748 bytes
SHA-256: 1a66de417b8b303818720de6b863f4c0e71259c01bb1a31a0b5f67ac61b81885