Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d287ceae45388a1…

MALICIOUS

PDF

104.9 KB Created: 2021-07-03 10:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f4f009964926768cc9b524c17b24ad61 SHA-1: f48f68f5a48f3ee93814228890c6031d5e10309f SHA-256: 9d287ceae45388a17f71c3e5d1147b27db54c0f67665cae89ca8cd64c340d33f
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. Heuristics indicate the document contains a link farm pointing to multiple compromised WordPress sites, likely serving as a lure. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9747

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://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706c6f1f2d6---41517069511.pdf In PDF document text
    • https://incoyun.com/calisma2/files/uploads/tubezafabutugi.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/7ec0caf3bda2490bf95394ea02abb9a6/mokixawabubepinisizu.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd6ca2de10---tuxezufi.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/04eab8ca0eab15bf3fb6c9c408c3f482/63280761175.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/napipun.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/5390839066.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792f2ab06a3---78016133605.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160a14d7065a32---mopogexufupujobemubiruk.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/77f6c7d0a3d98384c56141fae4bdfd63/56831972643.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bb1099303---fosutodiwisuvi.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/31k5sp39c60o79dd4pipnvjb60/leruvegom.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/47679e89773dc0a206e55ce8d662bb01/18380694580.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/femijazo.pdfIn PDF document text
    • http://statenbracy.com/clients/d/d3/d362857cea7b6c304c7898dd6c6993b3/File/jufuwobodajifumavudax.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/47abd5c5ca02e9868dfdc9edcbd7cf05/wubalunigepojakufadagafi.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/e29462f5b8661258d7ab3bc8ea14791f/76375165634.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac28d92dcd5---34621320334.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/11902343136.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/77561512081.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/9e6c56b460c694fd7e7d9948b8da951c/16308109679.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5299191f34442478b30de3b114afdd34/23783577033.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/66987784691.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/napupivifusotikujakil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+meaning+of+punishmentPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/59c0e0ce07bb86e7d3397bd171127bee/gilotemuzamejufuj.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000f08c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF08C 19500 bytes
SHA-256: 4ea69c97d3c6abef4ecba13d1cc1d51575ec21c73ed4cfe1d2674889a1f45296
font_01_sfnt_off000111d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E6 27684 bytes
SHA-256: 608113890f7b93c5469d486f7ad6b1597181af058f3dc3b22ab1773b3e1b8d77
font_03_sfnt_off00016a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A65 4472 bytes
SHA-256: ec11629d42e9c7dd3cb5385fc0af95aec050ba82e7cd81edfe71db8caa77a0e2
font_04_sfnt_off00017ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AE7 10724 bytes
SHA-256: 0bd665e2b5021717185450a3e345ca052dc5b8e0c04a29a57daa45a95f384f97

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