Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb2231c0f943128…

MALICIOUS

PDF

88.4 KB Created: 2021-06-27 07:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41a2b4b95102dda5232a82d963de02fa SHA-1: bee2c18e93b7cb3617758315101fd6cd6f766eec SHA-256: 3fb2231c0f9431281cd73afda8a2faa3a16449ae03a846b703c101d7d1e19814
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress uploads and disposable hosting domains, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to deliver a malicious payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://asupuro.com/user_data/image//file/56823106324.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/bb805549a16550568842742e9124d653/jubelexozumixibuzonabov.pdf
    • https://circolodelpistone.ch/userfiles/file/4082423986.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/228e9258390640a7ed5de99444b429d5/12539178580.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c1f402b6d---jakotu.pdf
    • https://maconlux.lu/userfiles/files/81220367459.pdf
    • http://asja-doll.ru/userfiles/file/rufekamozonazif.pdf
    • http://dalnoboy.org/data/filestorage/upload/files/nopipuroteveranelakejik.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae936d8e12e---jofij.pdf
    • https://strechybenesov.cz/content/dokibozodixusekis.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/0vu49ikfi1qao3bi084fofp8am/delokubobakaxu.pdf
    • https://recapress.com/ckfinder/userfiles/files/37701606995.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609aead3cfae9---45913548304.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c385a0297---lataxak.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1615195343dfec5652ccf777f65ed15e/penusad.pdf
    • http://kasargod.net/uploads/file/19352490904.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0dfc9552f---lesuwowelij.pdf
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/zusadopugudimesajoroman.pdf
    • https://careersourceokaloosawalton.com/files/public/xubijukonikonunusuwonale.pdf
    • http://wittlich-luexem.de/userfiles/file/27638346106.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/kumegozogeduboweguxufog.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160707b6139a18---nexogavigovavaviwij.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=left+side+neck+and+head+pain
    • 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_off0000f833.bin
0c665a417aa6dca6e038c83e04ad5b9c2e2d3ef0de05d011536314c3576d741e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF833 16652 bytes
font_01_sfnt_off00012337.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12337 16792 bytes
font_02_sfnt_off00013b4e.bin
4c6fea957e7619b6860b577dfec6944d68854a6050c3982b95b19dc3ea562786
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4E 10500 bytes