Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c364c7d1657e9d…

MALICIOUS

PDF

77.0 KB Created: 2021-07-06 03:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17427f03cf90b2f12d67660d40e37ab7 SHA-1: c9f1b69f7d8e373253a810010d74ae9c12a32eed SHA-256: a1c364c7d1657e9d0ab9e35017711d577f0c299a2bc0d4434d342d9a209d8b6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content or phishing sites. The presence of these links and the heuristic firings indicate an attempt to leverage external resources for malicious purposes, likely involving user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160813e33a9afd---49474410766.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/2696edc85903fb637e718ea6b4cd39ba/kikuvenonugirebefuti.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/2a324e844490eac6c4cc64d48ba5b880/gopefapamitamulerezopu.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/c2733b3588274d8409d70c1edc2c8766/sugisuxetapovo.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/1th686jnldm03hh3uslapuk1pc/kuxudozotimafi.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-14/20210514121635490131.pdf
    • http://msiutilities.biz/documents/94784798427.pdf
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/zubidu.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/f8ce57d1ccc2cdd30170085edaa7cf26/92784623170.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/he8fc4ft5r2kpdicp5p6tq1co4/94945104446.pdf
    • https://qpshouse.com/upload/image/file/zogarivedulel.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/520850480dcffa5d902620ef585767fe/weworezumematerobuwik.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/hu353gu4m2vvkofu5mk03b2jj1/pavogimokitomofugujotoj.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/1c824252ac58bf09bfb75f026f271b29/23610453257.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/1t64ap6lkrfnrsv76ifgl5frk3/jiwusolidorosopowero.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6dc7c6e328fbeea7c59d6e6ad2a02e10/17061707423.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-6-28/20210628210507692453.pdf
    • http://aklond.com/UploadFilesfile///2021050314555011.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/90b970b56d6a4652b23c88884648bcb4/xunolarozi.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093c8c38de87---67400923771.pdf
    • https://bwawarszawa.pl/upload/file/lanuvutegag.pdf
    • http://robbes.nl/media/files/taven.pdf
    • http://shosholoza.de/file/gelutofatirolumetefogome.pdf
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/11274576476.pdf
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/fefakixivere.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=bses+complaint+phone+number
    • 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_off0000cb93.bin
22b26f093628856d02ff1f45c46a0e91f88fb7a91cc3c9769f8f14fe20748b99
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB93 10932 bytes
font_01_sfnt_off0000e477.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE477 16792 bytes
font_02_sfnt_off0000fc89.bin
f8d7531b3b7dafac846344696b6e88414d61c99ae369d5c8162a654143f3a34c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC89 16316 bytes