Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5afc165c1fd3109…

MALICIOUS

PDF

127.5 KB Created: 2021-06-18 08:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 20fe0a57460e9798976419b053cd30f3 SHA-1: 67493abda6e26242a5859ac83c6b9707cae89094 SHA-256: a5afc165c1fd3109a6c42a22b59b43ec62e7191a8ca14de5fa38bc351289c3f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b1d25d56be1d4f7b1e3594d0a9a716f5/93263920619.pdf In PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/8b5b26082ae67ec7a9c85a4f4b4b3610/xurenoxu.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5439534a76---fudukatijezozisasitirili.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/983c34c074e9e71f0f6a343460fb66c8/fogamutokamejate.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/nuvizid.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6c6aa2dbe---78453224414.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/9ed8fd3e5510f2ce665f44bcdfa0ad2a/94163547600.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/tidubagemolulel.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3088d7b76---bazotoxobenozosemasafo.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdff2c6551---32031851140.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/xorilezidorusususisu.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/c9b0987554068e3a52afbdbc3c05aada/8141145779.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
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=dil+diyan+gallan+movie+parmish+verma+watch+onlinePDF 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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15495 5528 bytes
SHA-256: 6bcf954ef94b9464a24a5fd312aac4f767991b8e2b1f0580ba2d681838619d44
font_01_sfnt_off00016749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16749 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off000172ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172AB 3004 bytes
SHA-256: 1afc031754cc488b1a4db34578a5e7afe098ce29690d15630afc7962cd4866c9
font_03_sfnt_off00017f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F28 12740 bytes
SHA-256: bed84f0a2e859d6de2efd0555e69a7a56d8696ec5d06f7115a5005f938587f98
font_04_sfnt_off0001aa11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA11 16124 bytes
SHA-256: aca4cc7a4adecbe8d3b69816f606a775e78e0cb22b4b713e3bf6556a18461847
font_05_sfnt_off0001befd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEFD 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
font_06_sfnt_off0001ccfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCFE 10696 bytes
SHA-256: 6a1c942f8d9f1ec16ea35f6eff1811c4f36b7135910d35455e1f6f0c4722f23c

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