Malicious PDF — malware analysis report

Static analysis result for SHA-256 45cc2d12f71d08e6…

MALICIOUS

PDF

73.6 KB Created: 2021-09-21 03:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 17f8d8ce4862dcfb948e47fa2c15f796 SHA-1: e1e5d3f8cd66b83119361f620f83aa39116ef1f7 SHA-256: 45cc2d12f71d08e6b7baf527845cad3f20499e03fabc9f7576cca4d29f10177c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, many of which point to disposable hosting or compromised CMS uploads, suggesting a link farm designed to obscure the true destination. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to prompt a callback, consistent with phishing or scam tactics. ClamAV detection and ML classification strongly indicate maliciousness, likely related to phishing or a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d2ba8a79f---26951684177.pdf In PDF document text
    • https://santehsevast.ru/userfiles/files/29808037822.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/jebulekoduwilaroduvil.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/67079656708.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/baloxuriwigemuwuv.pdfIn PDF document text
    • https://slide-bearing.com/d/files/66996929044.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/84714699941.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/60073807614.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/xibuseragapewaxofanulo.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/54035665994.pdfIn PDF document text
    • https://salwangurugram.com/files/fidirak.pdfIn PDF document text
    • https://andana.us/files/files/vunelesupewaxuwol.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/2bp8vfgciov2ucho8b5234ln27/96703165753.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/30982c9c9dbb71eadb3f7dffecb4c61c/41481388312.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/wuwonivob.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/zuzivotawibetumilaxif.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/99265309983.pdfIn PDF document text
    • http://xsteelstock.com/d/files/6480839497.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/52693341003.pdfIn PDF document text
    • https://unitjaya.com/contents/files/6247208694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=android+disable+dataPDF 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_off0000bd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD92 17036 bytes
SHA-256: d12dcce9d0dcf2ec074925b1cf12dcb1b61ad3749c1e60497199fadd97207591
font_01_sfnt_off0000e9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EE 10364 bytes
SHA-256: e0461f5ef0b4a51f0285e30cec2df77012008d1d8bf149b553d089e472e23023

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