Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b54fcbcf9d08d29…

MALICIOUS

PDF

95.9 KB Created: 2021-06-30 09:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8acce3e0bfcb173bb1139ffb3d0115d4 SHA-1: 15e1ed11b792bf7c0c7ce08fee111bb225b86806 SHA-256: 4b54fcbcf9d08d29d73cfb26ab437a99594b992179d5778a3d6fc3e3de9e5c2d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. These links likely serve as a distribution point for phishing or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://maility.pl/_ADRESuserfiles/file/27640556385.pdf In PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdc93257ff---26924031627.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ebb914264---15968099623.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f88cd4a443---68846007630.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/568b7c01be8c06947e00436ff743dc9a/22190478752.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/rcbjla6fvh4d3ti80dbqupj9n4/vulixepowog.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/pabezubupiwunafe.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b425bbca978---dafajolisigajakedu.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2021bf13c6---15500325701.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/70060591c315f2a8e8f03f5424c430dd/53094552680.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeb975f438---7343238166.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/rlb1r03matg2pj0gvdl9m0b0ot/25801153594.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ec6e2082e---tevulozoluvinovep.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/bd64640952a456d3f7fecafdafd9f489/67244107668.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/40118340837.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/warif.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/db5fiv2cnll2o4gcodocqg9rmp/68868413755.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/09cf02e5c29bb2e93f9e22e5d5731763/dupiwi.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/xosixafidevox.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff8ff33b32---seriwuvifarusubopalubevag.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/1kgp8228gv6r5r507b5vdeq850/65408943906.pdfIn PDF document text
    • https://susta.vn/userfiles/file/nejobulejeredimiriget.pdfIn PDF document text
    • http://beta-rc.com/upload/files/nadiramadejalor.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089713c9dc21---gozakofukolib.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/32b204c18ddc13e1d85d6181953ee0f1/lililuzikis.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd783e3c3d---kipaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=red+hair+red+dressPDF 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_off00011712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F29 10024 bytes
SHA-256: 3d9515fb119271bc0e49c664549faf1aa4502dd324528abaf1607b46cc6dc7a6
font_02_sfnt_off00014585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14585 17276 bytes
SHA-256: 9e3f8790c1d4f62d21f30c135442ef19b85cd373f77b882239d69073cd038f16

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