Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd32d1a63ddf318…

MALICIOUS

PDF

110.2 KB Created: 2021-06-18 09:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: a62e865565efa94ad0c479f1ef32df13 SHA-1: 7f6648bab76ba8912c2ca2fbc930cd491907b7d4 SHA-256: 1fd32d1a63ddf318480b9772361d73bbd625fe931c39bdec6b1d7665010f936f
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aep-tc.com/cache/fck_files/file/kupuburizuzegarovovom.pdf In PDF document text
    • http://msinziniering.com/userfiles/file/80087856758.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/0tfb4jbcicb80tj3qkauudb56k/96482625752.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fd3a7eba4---gulimikomexefej.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/48ddb1mqoucsat1lmshbbl0onv/95573107436.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/bogunomiwevizebemevo.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/dexebovedutapafegafusuti.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/gg0s14lkkh05bbubqeki2fa0nk/31105177332.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbcac28d6c---gurar.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/tokezojububuzeped.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/fd200355b75ed8f7b12b4dff4cc2f5b7/91950767139.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/8ef6c30a36b2f78c2997495758d46461/zutojode.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/63149833594.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160888d1a72d34---dazoforazelujeboboduzu.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/zuwolofomebijazige.pdfIn PDF document text
    • https://plasy.com/uploads/file/filijiwizuvabasata.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/91b2c4b0ce6702870d5ef802f5082d75/butagipeletitojipid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=percentage+questions+for+bank+po+pdf+downloadPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13700 5744 bytes
SHA-256: 5f90acb59dabb74f22d9e8a5df09d516b7c41fdbeb85d20e49b6a677639bfd84
font_01_sfnt_off00014aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA7 11836 bytes
SHA-256: 783dfd6f0e5d1e86e55adf1e5fa58f39c2e2ef5f62512f8e5baa2ef18d347f03
font_02_sfnt_off0001731a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1731A 18588 bytes
SHA-256: 93738d1a5481618c765e6172f0006e0f35e4e5f819fdb4c9016afb5e18b06fb5

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