Malicious PDF — malware analysis report

Static analysis result for SHA-256 a345e461dc4a2aad…

MALICIOUS

PDF

82.9 KB Created: 2021-09-06 21:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 30986a867ca7fb507ab8c374e5407d9d SHA-1: 89b3035ab430f5e5914fed83da90ba71b45022b5 SHA-256: a345e461dc4a2aadfebc1bbd9c4c0c9dc104583f1cf0107047bba43e79fbb759
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and URL patterns point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/d64f9d48cecb14a9d42adf8884dd5b63/xivizezubudatufeko.pdf In PDF document text
    • http://maturitni-ples.eu/UserFiles/File/tikabonebufazopato.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/girilodigupalotosuwiw.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/5817k62detobbg7vclatfpmfa4/82449738842.pdfIn PDF document text
    • https://designclarf.it/file/mivuloju.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/d992932eb33b9d84cb0d13e2463cf42e/98567593500.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/be8c444c85456f396685d64dee2d8fb6/44679769380.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b597e638892---95412040882.pdfIn PDF document text
    • https://gangnampools.com/contents//files/vatezexuxukiba.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/xajuwezejofag.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160890cb57817d---xuriwowumubakizisasi.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/jitetif.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/86387254991.pdfIn PDF document text
    • http://compsult.net/userfiles/file/tatadigafubolisonabojavew.pdfIn PDF document text
    • https://alutat.com/data/file/78450973467.pdfIn PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/73479490473.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/legerapozegilo.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160928249272d1---42719276309.pdfIn PDF document text
    • https://papiratisk.cz/soubory/74803436727.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/4r7orbpum2bm0bo2v0rij689f0/66531353791.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16087b50a1b098---suwugapikodumono.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/gasirejadapuziwevakezames.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/a01b04c5d0cdabf6b0ad5ea52ed46944/dukabebuni.pdfIn PDF document text
    • http://splogservice.ru/content/file/posixowivujol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=kalender+2018+ferien+niedersachsen+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_off0000d987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD987 19684 bytes
SHA-256: 1ad9d7f22fab1a14424001df8fe54a7e972da5a224d4d8ebde1aaee9d3a9b986
font_01_sfnt_off00010c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4C 10992 bytes
SHA-256: b9e87499027ca0a4d5154071976c93311b2a7a5ecffecc42c3b9514a30b81523
font_02_sfnt_off000125d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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