Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeb7288955af2a30…

MALICIOUS

PDF

87.3 KB Created: 2021-09-04 00:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e9b4629a541c6f4f521e0bd505e2d088 SHA-1: 9710832df45da0d34bf2b7d38252a08b921d2195 SHA-256: eeb7288955af2a3077fd486fc1fac5f456ae1d60b70e7efd6f67f691195a08db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to drive traffic to potentially malicious or deceptive content. No scripts were extracted, but the overall structure and URL analysis point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a8ad7118f---gajamok.pdf In PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/j8s6blvt8dg9r68gjgc66b2dkk/20366327967.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/g1cmg0jiii5bei53cvr3esbpu0/vekikukepijolemibatupik.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/desefomoriguki.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/b4bab220bf6a25d579531364e4920c28/14856072192.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/gafusiwezalinaronar.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/bujokur.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/16177935d6147d528e77322b300be9d7/kodafusisadepivamalara.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072e1b68a8bf---kemosot.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/13849577425.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dd316a09f---zoteworegogej.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/gisulosanesesumiwu.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/gesilimabitugu.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/xetidawuzitagomivotilixu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/559edika0habo1q38s98eussh0/pomubinom.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/mibem.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/88742625158.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/98696291745.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769b5eb927e---guwepop.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c03a605a07---dakemixesuzow.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/83135975113.pdfIn PDF document text
    • http://safarang.com/basefile/files/kajapexufividunipu.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/dcc1762480a609ec927e38f2955b97ac/43371602367.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/67038260062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=hodgdon+reloading+manual+2017+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_off0000eb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A5 19224 bytes
SHA-256: 50deaf1e3470bc666013273b4e5bdc8764b8c814ac7f3822053006b485ce0e60
font_02_sfnt_off000135a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A6 11012 bytes
SHA-256: 0d83ac8c38c675349fe0495b9071ecd923792997862590d16a594fe5846f6334

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