Malicious PDF — malware analysis report

Static analysis result for SHA-256 d536d870e3639f56…

MALICIOUS

PDF

76.1 KB Created: 2021-09-04 09:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 54669bb3a0f138d5e916d11d148369a2 SHA-1: e623017ab610ede50741403203e98371e04b3676 SHA-256: d536d870e3639f563a5b80a3c6749f3e1b1f258ffb8f0111a01bdce8a244d579
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan attempt. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress upload directories. The primary purpose seems to be redirecting users to external, potentially malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16104f0b1bdfa3---93275763307.pdf In PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/pijugedaziduwawidufawape.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160d7fb0305de9---bikupisu.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c460cd33b4f---wusepi.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f73c6cc25---78018323188.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/vatuxu.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/mudoja.pdfIn PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/35904727641.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9842c18693---84156892911.pdfIn PDF document text
    • https://termoformat.md/img/files/parakagenikezetafuku.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/wisatuxolekovuvizuxav.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/d9f6ba1de6d9eb590b3bcab23a2c429d/velituz.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/juwedepasebajizanedak.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/retowepejusob.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776372609ab---94930193605.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/b3ba921a08ca366668f7ee73528a922a/36965717877.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/5a4d4abc7bd54fe7bdb0f4abf9c6d172/9549835021.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/82100366807.pdfIn PDF document text
    • http://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/61669556209.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/5040683974.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/ludoravoj.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/betajonekirogujosetadunaf.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/dufitotebavusimugu.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/cd4ff7983377b0884f9d286d3c849004/90997102507.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607df1bc04a94---85498335461.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607178bb6e65f---linaxuwodebozepim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=grade+11+chemistry+predicting+the+products+of+chemical+reactions+worksheetPDF 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_off0000c4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD9 11552 bytes
SHA-256: 6e3e33a6c050073730f052970f968a07cdf730923cb3c568eb4376ae19d108c5
font_02_sfnt_off0000f7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F9 16540 bytes
SHA-256: c9ded874689692d218982a00b04983c352d4df70f0bf786245f1da0dd2368d79

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