Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25001135a789ba9…

MALICIOUS

PDF

139.2 KB Created: 2021-08-15 12:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4abd9db2e14876dd7827eab39c33dc87 SHA-1: f13464257b3cab1b3e49de932c3d067b08772624 SHA-256: b25001135a789ba9eb52f6b853d26cd15426b0c4ea7fbb05c30abb2b4f47ef35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress installations and disposable hosting, indicating a phishing or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/caa045fed032133674c44b0cf2c47d21/62833099505.pdf In PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/c7b7aa3f8dd6bd6dc2fe31117bebbb59/rekof.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160724d975abe4---kuxin.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/81285854760.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/5e7b49c444530845a5d5d2b6b1dfb788/sazemopunikivexixorojali.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610474ffcde02---dewikuba.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/14dc01323cd61aaeead68a68958c28d3/ribuzirus.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/egpf9nvpkkfb1el3j4pbllj95h/13950763394.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/6991dac565c09743435c6ede12a13889/tixomunebelukazesajexu.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/731576543.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b97052bac7a---657361464.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/mikusabanolipoki.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/36642f3a0e69fb9066767064c19eeb4e/54415922067.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/fezinobi.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd13cdbeaa4---musejavalelujuval.pdfIn PDF document text
    • https://yildizwebpaket.com/calisma2/files/uploads/zugalowivupepekifiliwena.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c92e966bb4---juwelajaturafodinabiw.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160783fab65479---lokapozobujagelewip.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/71298742709.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/vedusagi.pdfIn PDF document text
    • http://mths1965.com/clients/6/62/626de2090e8268457c7577d5e8b87900/File/78617246896.pdfIn PDF document text
    • https://tempegaring.com/contents//files/71055293230.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/dituxeturiwiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=abituriyent+jurnali+2020+kecid+ballari+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_off0001bae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BAE7 11124 bytes
SHA-256: 9cc7c0c7fde17dc915410fdde3735c68f3758237b60d1fb5465c8a0674f205c9
font_01_sfnt_off0001d4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D4DF 19492 bytes
SHA-256: 1fb88f40d4cf47cbcdf37baaaca5afce22892e8900befcec1e871ea3c8a5ae1c
font_02_sfnt_off0002044a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2044A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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