Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2997ead2533df6d…

MALICIOUS

PDF

84.4 KB Created: 2021-08-10 13:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b02665414b2101ee4e7375c1056376c5 SHA-1: 05405f0de32fdc63d4c133a64b4b9122e109789f SHA-256: e2997ead2533df6d3fb1c367ff320a1f580bbe30f7d60417112f0934a07a36a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely serving as a lure for phishing or malware delivery. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.allterra.group/wp-content/plugins/super-forms/uploads/php/files/08c49b5219b898c6068356f21465a022/47988142409.pdf In PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084352f12e4c---xanedobinisesabukir.pdfIn PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/woresejewekokadiral.pdfIn PDF document text
    • http://zeci.nl/im/image/botigafosoxobegirogoz.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/nuximutig.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/pv0lpqm8u5s9rmnl42pj5jrgrk/10475799698.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/n9pafvo1dhmu5c8b06srtrhnn5/22730751749.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609af02f666e3---37991484122.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/43299119511.pdfIn PDF document text
    • http://18554080.com/userfiles/file/jimaxut.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160816be9aa498---64666476477.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/25479502924.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/fovenivera.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/b90726d67b0f1611ce8544974d6f72bd/rusufibozasanojukin.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/50164757418.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608432670e334---bejalabofuwuniwusebike.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/voxotagorejugilebadefi.pdfIn PDF document text
    • http://lawngo.net/fckfiles/89781482101.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/kibrsmro3to2jaoov71jdmen0m/87239007185.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de9ffe596c---68620277261.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/gudabofopazobawefumureraz.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3da8915661---lonemeluxadosijaxidozat.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/37899605299.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4452ea3ea4---kajamukevoworajuzavu.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/32374961489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=best+carding+methodsPDF 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_off0000e709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE709 10824 bytes
SHA-256: 6802f42926a6689bedbbc13076b2a42a79d960ec60bfb7dd8569f3982a0f3099
font_01_sfnt_off0000ff9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9D 17056 bytes
SHA-256: c0caed8755498bbb06fc008f775404afac9ab5f1d4db7ed3ebfc36c4430f1eb0
font_02_sfnt_off00012c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1