Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71177e638ef9e0c…

MALICIOUS

PDF

91.0 KB Created: 2021-07-03 05:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81a41dcab4da01e27118903e00fa9517 SHA-1: db8e697e619e6cc41b3eeb1b3789410ae92d966f SHA-256: d71177e638ef9e0cf42afd5b133ab16e49ad226dc209381cf3f43a975bc1bd76
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. The file's structure and numerous external links align with techniques used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2f0690951a8cf57f3b4c1b8e84576d5a/filaranitiv.pdf
    • http://asiadomainstore.com/userfiles/file/xekubo.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607da20a19ae7---xifubobufu.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac59347a14---12990440401.pdf
    • http://lutechmed.com/Images_upload/files/57786395950.pdf
    • http://alhouti.com/userfiles/file/59868778291.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa300f87261---8122749056.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f100bb3fda---74916916682.pdf
    • https://dbjadow.pl/attachments/file/duxidoko.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d57c423337a7d5cd336ed5e935c25027/magimabuxanano.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/t2cq0qurge16stl6h8ta0qb7o7/segurimemufuto.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/93b09f4615d49660cf868cad16fbddfc/18907106200.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/kunozososulera.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/d8g5uf2ujdhq6mbogug6t3iof3/baratejanevatexovezox.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3a19874b0b3f4218eef13c48b48f1d71/wasega.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ng7968acqf8mk4qbqifujbuavm/tatafigew.pdf
    • https://toromecanicorodeo.com/files/67255241005.pdf
    • http://thetuckerfamilyreunion.com/clients/67950/File/1974905980.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607db19882496---gameru.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d19cd1168b1---78210128733.pdf
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/sidomonapukepidix.pdf
    • https://bbpartner.cz/userfiles/file/60635988676.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c4364322---9148107634.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16070dc99188d0---gevirimamize.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=writs+in+polity
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010163.bin
8c361fb0155fea32cf85df00f248c7a92bfbe55f88a6e9629eb61896ed43cca7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10163 18224 bytes
font_01_sfnt_off000130ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130AD 16792 bytes
font_02_sfnt_off000148c4.bin
1d74c83476b2bbb5e180f73ac45b7b1e5b10b06e412a15d65fd727a7ef208e1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x148C4 10060 bytes